Explosion at Mexican oil giant Pemex headquarters kills 25

A powerful explosion rocked the Mexico City headquarters of state-owned oil giant Pemex on Thursday, killing at least 25 people, injuring more than 100 and trapping others inside. The mid-afternoon blast in a neighboring building shattered the lower floors of the downtown tower, throwing debris into the streets and sending frightened workers running outside. A government official, speaking on condition of anonymity, said a preliminary line of investigation was that the blast came from a gas boiler that exploded in the adjacent Pemex building. But the cause was still being determined, the official added.