Day In Pictures 12-1-11

( Arif Ali/AFP/Getty Images )

Pakistani students march as they shout slogans during a demonstration in Lahore on December 1, 2011 against the cross-border NATO air strike on Pakistani troops. Pakistan said it could not attend the Bonn conference unless its security was ensured, appearing to set a condition after Washington led calls on Islamabad to reconsider a boycott. The cabinet decided on the boycott to protest against the deadliest cross-border strike by NATO that killed 24 Pakistani soldiers in 10 years of war in Afghanistan that has plunged the uneasy US-Pakistani alliance into perhaps its deepest crisis.