A、The bombers bought return tickets from Luton to London. B、The bombers were masterminded by al Qaeda Islamist militants. C、The

Police have not yet definitively established that four men who carried bombs un to London’s transport network intended to die in last week’s blasts, a Scotland Yard spokesman said on Saturday.
   He was commenting on a report in the Daily Mirror newspaper suggesting the bombers, who all died in the July 7 explosions, may have thought they had time to get away after planting the devices.
   Police have, carefully refrained throughout the  investigation from publicly using the term "suicide bomber", describing the four men only as bombing suspects.
   Fifty-five people died in the blasts on three underground trains and a bus. Police suspect the attacks were masterminded by al Qaeda Islamist militants.
    The Daily Mirror report said several factors cast doubt on the suicide theory—two of the men had pregnant wives, they did not carry the explosives strapped to their bodies, and they bought return rail tickets from Luton to London.