SANT' AGOSTINO, Italy (Reuters) - A strong earthquake in northern Italy killed at least six people, injured dozens and damaged historic buildings including a famed mediaeval castle early on Sunday, waking terrified citizens and sending thousands running into the streets. The quake, which the U.S. Geological Survey recorded at magnitude 6.0, struck at 4:04 a.m. (0204 GMT) and was followed by a series of jolting aftershocks. At least two of them reached magnitude 5.1, sowing fresh panic, further damaging already weakened buildings and causing more structures to collapse. ...

SAN FRANCISCO (Reuters) - The chief executives of Apple Inc and Samsung Electronics Co Ltd are used to running the show at their global tech empires, but they will be in for a different experience when they arrive at a San Francisco federal courthouse on Monday. Apple's Tim Cook and Samsung's Choi Gee-sung, whose companies are embroiled in bitter patent litigation, have been instructed by a federal judge to appear for court-supervised mediation. A joint court filing in April said that "as directed by the Court, Apple and Samsung are both willing to participate" in the discussions. ...

On paper at least, European leaders agree: They need stronger growth measures to help their economies expand out of their 2½-year-old government debt crisis. Figuring out exactly what those new steps might be will be the hard part.

He was the embodiment of one of modern Libya's darkest chapters — a man synonymous with horrifying scenes of wreckage, broken families and a plane that fell out of the sky a generation ago. His name, Abdel Baset al-Megrahi, was little known compared to the single word that his deeds represented: Lockerbie.

Nationalist candidate Tomislav Nikolic won the Serbian presidency on Sunday, a result that adds to the political turmoil in the Balkan country and could slow down its attempts to join the European Union.

CHICAGO (Reuters) - NATO leaders charting a path out of Afghanistan sought on Sunday to dispel fears of a rush for the exits in the unpopular war even as France's new president vowed to stick by his pledge to withdraw French troops by year's end. President Barack Obama, who once called the Afghan conflict a "war of necessity" but is now looking for an orderly way out, hosted the NATO summit in his home town, Chicago, a day after major industrialized nations tackled a European debt crisis that threatens the global economy. ...

CHICAGO (Reuters) - New French president Francois Hollande likes to style himself as "Mr. Normal," but his sudden debut on the global stage this week has been anything but. From the Oval Office to a meeting of G8 leaders at the Camp David presidential retreat to the NATO summit in Chicago, Hollande, a life-long party official who has never held a ministerial post, sometimes looked as though he were trying the role of international summiteer on for size. Despite some awkwardness, Hollande appeared to pass his initial diplomatic tests. ...

TRIPOLI (Reuters) - Abdel Basset al-Megrahi, the Libyan convicted of the 1988 bombing of a PanAm flight over Lockerbie, died of cancer on Sunday aged 60, leaving many questions on the attack and its aftermath unanswered. Megrahi, who said he was not responsible for bringing the jumbo jet down on the Scottish town and killing 270 people, was found guilty in 2001 but was freed in 2009 and returned to Libya because he had terminal cancer and was not expected to live long. ...

TRIPOLI (Reuters) - Abdel Basset al-Megrahi, the Libyan convicted of the 1988 bombing of a PanAm flight over Lockerbie, died of cancer on Sunday aged 60, leaving many questions on the attack and its aftermath unanswered. Megrahi, who said he was not responsible for bringing the jumbo jet down on the Scottish town and killing 270 people, was found guilty in 2001 but was freed in 2009 and returned to Libya because he had terminal cancer and was not expected to live long. ...

More than 100 Egyptians held since a mass arrest over two weeks ago began an open-ended hunger strike Sunday to protest their continued detention and the possibility they will face military prosecution, activists said.

CHICAGO (Reuters) - Protesters marched through the steamy streets of Chicago on Sunday, carrying an anti-war message for world leaders at a NATO summit and led by a group of Iraq War veterans who planned to give back their military medals. Police estimated the crowd at 2,500 to 3,000 people in what was the largest rally so far in the week leading up to the NATO summit. Riot police watched closely as the demonstrators - some in festive costumes, others in all black with bandanas over their faces - staged by far the biggest gathering in a week of protests leading up the summit. ...

CHICAGO (Reuters) - Protesters marched through the steamy streets of Chicago on Sunday, carrying an anti-war message for world leaders at a NATO summit and led by a group of Iraq War veterans who planned to give back their military medals. Police estimated the crowd at 2,500 to 3,000 people in what was the largest rally so far in the week leading up to the NATO summit. Riot police watched closely as the demonstrators - some in festive costumes, others in all black with bandanas over their faces - staged by far the biggest gathering in a week of protests leading up the summit. ...

CHICAGO (Reuters) - Protesters marched through the steamy streets of Chicago on Sunday, carrying an anti-war message for world leaders at a NATO summit and led by a group of Iraq War veterans who planned to give back their military medals. Police estimated the crowd at 2,500 to 3,000 people in what was the largest rally so far in the week leading up to the NATO summit. Riot police watched closely as the demonstrators - some in festive costumes, others in all black with bandanas over their faces - staged by far the biggest gathering in a week of protests leading up the summit. ...

The NATO alliance that has fought for a decade in Afghanistan is helping that nation shift toward stability and peace, but there will be "hard days ahead," President Barack Obama said Sunday as alliance leaders insisted the fighting coalition will remain effective despite France's plans to yank combat troops out early.

"The Avengers" continues to muscle out everything else Hollywood throws at it, easily sinking naval rival "Battleship" and other new releases.

Profiles of Egypt's main presidential candidates:

DOUMA, Syria (Reuters) - A roadside bomb exploded on Sunday about 150 meters (yards) from a United Nations convoy carrying the head of a Syria ceasefire monitoring mission and a senior U.N. official in the town of Douma, a Reuters witness said. Major General Robert Mood's car was stopped at an army checkpoint when the bomb detonated in an nearby alleyway and the convoy left, the Reuters journalist said, adding that there were no reports of casualties. United Nations Under-Secretary-General for Peacekeeping Operations Hervé Ladsous, who is visiting Syria, was also part of the convoy. ...

DOUMA, Syria (Reuters) - A roadside bomb exploded on Sunday about 150 meters (yards) from a United Nations convoy carrying the head of a Syria ceasefire monitoring mission and a senior U.N. official in the town of Douma, a Reuters witness said. Major General Robert Mood's car was stopped at an army checkpoint when the bomb detonated in an nearby alleyway and the convoy left, the Reuters journalist said, adding that there were no reports of casualties. United Nations Under-Secretary-General for Peacekeeping Operations Hervé Ladsous, who is visiting Syria, was also part of the convoy. ...

JOPLIN, Mo (Reuters) - Having the president of the United States speak at commencement would normally be the most memorable day in the life of a high school senior. But not in Joplin, Missouri, where President Barack Obama's commencement address on Monday will come one year after the deadliest tornado in the United States in six decades killed 161 people. "I'm pretty sure we will remember the tornado more than Obama's speech," said graduating senior Ethan Ritschel. ...

JOPLIN, Mo (Reuters) - Having the president of the United States speak at commencement would normally be the most memorable day in the life of a high school senior. But not in Joplin, Missouri, where President Barack Obama's commencement address on Monday will come one year after the deadliest tornado in the United States in six decades killed 161 people. "I'm pretty sure we will remember the tornado more than Obama's speech," said graduating senior Ethan Ritschel. ...

JOPLIN, Mo (Reuters) - Having the president of the United States speak at commencement would normally be the most memorable day in the life of a high school senior. But not in Joplin, Missouri, where President Barack Obama's commencement address on Monday will come one year after the deadliest tornado in the United States in six decades killed 161 people. "I'm pretty sure we will remember the tornado more than Obama's speech," said graduating senior Ethan Ritschel. ...

VIENNA (Reuters) - The U.N. nuclear supervisor flew to Tehran on Sunday voicing optimism he could reach a deal to investigate suspected atom bomb research - a possible breakthrough that Iran may hope could help ease Western sanctions pressure and deflect threats of war. "I really think this is the right time to reach agreement. Nothing is certain but I stay positive," Yukiya Amano, director general of the International Atomic Energy Agency, said at Vienna airport, adding "good progress" had already been made. ...

VIENNA (Reuters) - The U.N. nuclear supervisor flew to Tehran on Sunday voicing optimism he could reach a deal to investigate suspected atom bomb research - a possible breakthrough that Iran may hope could help ease Western sanctions pressure and deflect threats of war. "I really think this is the right time to reach agreement. Nothing is certain but I stay positive," Yukiya Amano, director general of the International Atomic Energy Agency, said at Vienna airport, adding "good progress" had already been made. ...

MOSCOW (Reuters) - Russia's deputy foreign minister said on Sunday that military action against Iran over its nuclear program was being considered in some Western countries. Deputy Foreign Minister Sergei Ryabkov was speaking to reporters on a plane on his way back from the G8 summit in Camp David, where the G8 leaders signaled their readiness to tap into emergency oil stockpiles quickly this summer if tougher new sanctions on Iran threatened to strain supplies. ...