The Happening (2008) 
A sudden surge of collective suicide secretly precipitated, through biological warfare, by the powers that be, but made to look as if it was brought on as the wrath of nature. If society is brought into a crisis, releasing a biological agent while using nature as a cover the perpetrators are given a cunning form of plausible deniability.
Full review:
http://1phil4everyill.wordpress.com/2008/1...happening-2008/