BASRA, Iraq (Reuters) - British forces said on Friday there had been "an incident" in the northern Arabian Gulf after an Iraqi fisherman reported seeing up to seven British or American military personnel being seized by an Iranian ship. "There has been an incident somewhere in the north of the Persian Gulf," British military spokesman Major David Gell said in the southern Iraqi city of Basra, without elaborating. He said he did not know whether any British or American servicemen were involved. The fisherman said the incident took place early on Friday in the Shatt al-Arab waterway that marks the...