The officers , part of a special operation to suppress violence and rampant crime in Borno State , demanded Request that the young men comply with a law requiring motorcycle passengers to wear helmets .

at one point , she mounted Motion_directional a harley-davidson motorcycle as it was elevated Cause_change_of_position_on_a_scale and made its path across the venue .

Some reports suggest Statement a motorcycle crashed Attack into the crowd and the rider detonated Motion explosives in a worn belt .

The bomb , which exploded Attack shortly after 16:00 , was hidden Hiding_objects in a motorcycle parked in front of the market next to a railway station .

The motorcycle was destroyed Destroying by the blast Attack , and a nearby car damaged Damaging , as were dozens of stalls belonging to fruit and vegetable vendors .