Palestinian Palestinian Prime Minister Salam Fayyad suffers a heart attack and undergoes surgery during a trip to the United States to attend his son's graduation.
People's Republic of China The People's Republic of China detains 300 Tibetan monks for "legal education" after a monk sets himself on fire.
Member of parliament British MP John Hemming uses parliamentary privilege to identify a married footballer named on Twitter as having an injunction over an alleged affair as being Ryan Giggs.
U.S. President U.S. President Barack Obama addresses an audience at College Green in Dublin, speaking of strong ties between the United States and Ireland.
There are reports of multiple structure collapses following a heavy storm and possible tornado in the village of Richfield, Pennsylvania.
The death toll from the Joplin, Missouri, tornado reaches 116, becoming the deadliest single US tornado since 1947.
The National Weather Service continues issuing tornado warnings for parts of the Central United States, including Arkansas, Oklahoma and Missouri.
Iceland Iceland's main airport remains closed following the worst eruption of the Grímsvötn volcano since 1873, with the ash cloud starting to spread towards Europe.
Steve Ballmer Steve Ballmer, the Chief Executive Officer of Microsoft, promises that Windows 8 will be on the market in 2012.
Maritime Union of Australia The Maritime Union of Australia commences industrial action at cargo terminals at Melbourne, Sydney and Fremantle, affecting half of Australia's maritime trade.
Soldier One Australian Army soldier is killed and five others wounded following two bomb explosions in Afghanistan; the total number of Australian soldiers killed in the Afghan conflict now stands at 24.
Arab Spring A Cairo court sentences an Egyptian police officer to death "in absentia" for killing protesters demonstrating during the 2011 Egyptian revolution.
Egyptian pro-democracy groups call for a new round of protests on May 27 due to dissatisfaction at progress in implementing reform.
French officials confirm France and UK are to deploy attack helicopters as part of a boost to NATO's attacks on Muammar Gaddafi.
Veteran British journalist Robert Fisk questions whether the sanctions will affect the Syrian government's crackdown on dissent, as such sanctions have failed to work before.
Syria's foreign minister Walid al-Moualem, speaking on television, attacks the European Union for imposing travel bans and asset freezes on officials.
The Gulf Cooperation Council suspends mediation efforts in Yemen after President Ali Abdullah Saleh refuses to sign a transition agreement for the third time.
Pakistani Taliban attack The death toll from a Pakistani Taliban attack on a Pakistan Navy station in Karachi rises as the attack continues, with several explosions reported.