Obama vows to tighten security

The US government has launched an investigation into the failed Christmas day attack on a plane bound for Detroit.

President Barack Obama says security measures will be reviewed, after it was revealed officials had previously been warned about the would-be bomber.

Confronting criticism.

Barack Obama was accused of slipping up on national security, after the failed Christmas day attack.

Now he's vowed to track down all those behind the plan, to bring down the US airliner.

Barack Obama, US President, said, "A full investigation has been launched into this attempted act of terrorism, and we will not rest until we find all who were involved and hold them accountable. The American people should be assured that we are doing everything in our power to keep you and your family safe and secure during this busy holiday season."

U.S. President Barack Obama speaks to the media about the recent air travel incident, Monday, Dec. 28, 2009, at the Marine Corps Base Hawaii at Kaneohe Bay, Hawaii.(AP Photo/Alex Brandon)