A not guilty plea has been entered on behalf of a Nigerian man charged with attempting to blow up a Detroit-bound US airliner on Christmas Day.
Umar Farouk Abdulmutallab was arraigned Friday on six charges. The most severe carries up to life in prison - the attempted use of a weapon of mass destruction.
Friday's hearing was brief. Abdulmutallab walked into the courtroom wearing a white T-shirt, pants and tennis shoes. He answered "yes" in English when asked if he understood the charges against him.
After that, his lawyer said Abdulmutallab would stand mute to the charges. The US magistrate judge said a not guilty plea would be entered on his behalf.