A Yemeni security official says a suspected al-Qaida militant accidentally set off a bomb he was preparing in a metal workshop in the capital, killing himself and injuring one other person.

The official said the explosion happened early Sunday in Sanaa’s southern Hizzayz district.

At least 10 police cadets were killed last week when a suspected al-Qaida bomber detonated his explosives among the cadets as they were leaving the police academy in Sanaa for the weekend.

In the southern port city of Aden, meanwhile, security forces arrested two people Sunday who were driving a car rigged with explosives but a third person managed to flee, another official said.

Both officials spoke on condition of anonymity according to regulations.