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Chatter: What we're hearing

Need to know: President Obama hosts leaders from 46 countries for a two-day nuclear security summit starting Monday that will focus on how to better safeguard nuclear weapons materials. But even as Obama met Sunday with a succession leaders to discuss better controls, his administration highlighted a seemingly dissimilar message, with top officials stressing the nuclear strength of the U.S.

Austrian authorities have launched legal proceedings against a Catholic priest accused of possessing child pornography and sharing it with others online.

A train has derailed in northern Italy and left at least 11 people dead and several injured.

Want to know: Investigators examining the crash of the plane carrying the Polish president, Lech Kaczynski, appeared to be focusing on why the pilot did not heed instructions from air traffic controllers to give up trying to land in bad weather in western Russia. Attention has been drawn to the pilot’s state of mind because Kaczynski, had previously argued with a pilot in 2008.

Republican militants exploded a bomb in a hijacked taxi outside MI5 headquarters in Northern Ireland on Monday, minutes after the transfer of police and justice powers from London to Belfast was completed.

American troops shot repeatedly at a large passenger bus near Kandahar on Monday morning, killing five civilians and wounding 18 and  infuriated leaders in Kandahar before an important offensive.

Dull but important: Observers on Monday urged Sudan to extend voting in its first open elections in 24 years after thousands of ballots were cast incorrectly and polling faced serious delays in many areas of Africa's largest country.

Just because: A group of three suicide bombers attempted to seize the main intelligence building in Afghanistan's southern city of Kandahar on Monday in a brazen daylight raid, officials said. GlobalPost recently visited the NATO airbase at Kandahar.

Wacky: Police in the Australian state of New South Wales reported that a courtesy shuttle bus was stolen and taken on joy rides by drunks in two separate incidents in the one night.

Royal Mail has stopped deliveries to a house in Leeds, England, after postal workers came under attack from an elderly cat named Tiger.