LONDON (Reuters) - A fire at a Chevron oil refinery in south Wales on Thursday affected a process tank and a truck, the local fire service said.

A spokesman for the Mid and West Wales Fire and Rescue Service told Reuters there had been a fire at a process tank at the Pembroke refinery and a fire and explosion involving a heavy-goods vehicle -- a term which could cover a truck or a tanker.

He had no further details about what had happened.

(Reporting by Adrian Croft; Editing by David Gregorio)