Some of world's worst mass shootings:
- July 22, 2011: At least 80 people are killed at a summer camp on the Norwegian island of Utoya. A man arrested also is suspected in a blast earlier the same day in downtown Oslo that killed seven.
- April 30, 2009: Farda Gadyrov, 29, enters the prestigious Azerbaijan State Oil Academy in the capital, Baku, armed with an automatic pistol and clips. He kills 12 people before killing himself as police close in.
- March 10, 2009: Michael McLendon, 28, killed 10 people - including his mother, four other relatives, and the wife and child of a local sheriff's deputy - across two rural Alabama counties. He then killed himself....more
11:54 AM, Jul 23, 2011