LONDON — A man threw petrol bombs attached with fireworks at a new British immigration border force center in the southern English port of Dover and then killed himself, a Reuters witness said.

The attacker, a white man in a striped top, drove up to the center in a white SEAT sports utility vehicle. He got out and threw three petrol bombs, one of which did not go off, the photographer said.

After the attack, the man tied an improvised noose around his neck attached to a metal pole and drove off, killing himself, the photographer said.