Putin promises full investigation into the cause of plane crash

As Polish President Lech Kaczynski's coffin is brought home, the investigation into the cause of the plane crash which killed him is continuing.

Russian Prime Minister Vladmir Putin is heading the investigation and is promising a full investigation.

The coffin is now lying in the chapel of the presidential palace as the enormity of the accident stuns the nation's people.

A date for the president's funeral is expected to be set once the body of his wife Maria is also returned from Russia. Russian authorities have confirmed her body has been identified and will be flown to Poland on Tuesday.

Russian Prime Minister Vladimir Putin, center, attends a farewell ceremony to Polish President Lech Kaczynski at the Smolensk airport, western Russia, Sunday, April 11, 2010. (AP Photo/Sergey Ponomarev)