• South Thailand insurgency:
  • Insurgents kill six people, including a two-year-old boy, in a deadly shooting in Pattani, Thailand. (ABC News)
• Boston Marathon bombing:
  • Boston Police state that three more individuals are implicated and arrested. (CNN)
  • A report states that Dzhokhar has told detectives he was motivated by wanting to defend Islam because of the wars in Afghanistan and Iraq. (NBC)
• Insurgency in the North Caucasus:
  • A bomb detonates in a busy shopping center in Makhachkala, Dagestan, Russia, killing 3 and injuring 2 others. (Ria Novosti)
• Iraqi insurgency (post-U.S. withdrawal):
  • Multiple bomb attacks across Iraq kill at least 15 people. (The Daily Star)

• T-Mobile US debuts on the New York Stock Exchange with the ticker symbol TMUS. (Reuters)

• Flash floods leave 16 people dead and 3 others missing in Saudi Arabia, with authorities urging citizens to avoid low-lying wadis. At least two others were killed in neighboring Oman in some of the heaviest rainfall in more than 25 years. (Al Arabiya)
• Heavy rain and a whirlwind sweeps over eights districts and towns in Lào Cai Province, northern Vietnam, destroying 52 houses and 2 schools, ripping roofs off of 1600 houses, and damaging crops of local people. (Talkvietnam)

• The UN Human Rights Office says that the force-feeding of hunger-strikers at the U.S. Guantánamo Bay Prison is a violation of international law. (AFP via France24)
• Several British Overseas Territories, including Bermuda and the Cayman Islands, sign agreements to share tax information with UK and other EU members. (BBC)

• A May Day protest in Seattle, United States, escalates into violence, causing injuries to eight police officers and damage to storefront property. (Seattle Pi) (CNN)
• British Coronation Street star William Roache, the world's longest-serving soap actor, is arrested and charged with two counts of raping a 15-year-old girl in 1967. (TVNZ),(The Guardian)
• Seven Venezuelan legislators are injured as a fight breaks out between the Socialist Party and the opposition over the outcome of the last month's presidential election. (The Daily Beast)

• In San Jose, California, IBM researchers release A Boy and His Atom, the smallest movie ever made, which was created by manipulating individual carbon monoxide molecules with a scanning tunneling microscope. (BBC)
• An international group of researchers announce in Nature the creation of a digital camera that can mimic the compound eyes of insects. (CNN)
• The Wyoming, United States discovery of a tiny prehistoric bird, Eocypselus rowei, may help explain the origins of hummingbirds. (Science World Report)