April 20, 2007 (Friday)
- 1976 Nobel Peace Prize Laureate Mairead Corrigan is injured during a peaceful protest against the construction of the Israeli West Bank barrier. (Indymedia)
- President of Cuba Fidel Castro meets briefly with Wu Guanzheng, a member of the Politburo of the Chinese Communist Party in his first official duties since transferring power in July 2006. (AP via Houston Chronicle)
- The G4 group of nations, which includes Brazil, India, Germany and Japan, says that it would revive efforts for United Nations Security Council reform. (NDTV) (People's Daily)
- India and the People's Republic of China resume talks to resolve border disputes. (NDTV) (Australian)
- The United States asks India to stop military cooperation with Iran. (VOA)[permanent dead link]
- The U.S. state of Virginia observes a day of mourning for the victims in the Virginia Tech massacre. (BBC)
- Battle of Mogadishu (March–April 2007): Shelling and gunfire continues in Mogadishu after 21 died in fighting and a suicide attack at an Ethiopian base the previous day. (Aljazeera)
- Scientists prove that eating less salt reduces the chances of stroke or heart attack in the first long-term study on salt's effect on health. (The Times)
- A series of earthquakes, the strongest being 6.1 magnitude, strikes the Okinawa island chain of Japan. A tsunami warning is issued but later cancelled. (AFX via Forbes) (Bloomberg)
- The 2007 pet food recalls: A new study of pigs at a hog farm in California points to the possibility that melamine has entered the human food supply. (Pittsburgh Tribune-Review)
- Johnson Space Center Shooting: A NASA spokesperson says that one of the buildings at the Johnson Space Center in Houston, Texas has been evacuated after an employee opens fire. The gunman killed a male hostage as well as himself. (CNN) (BBC) (AFP via ABC News Australia)