By Peter Graff
LONDON (Reuters) - Iran said it was not concerned about U.S. naval exercises in the Gulf on Wednesday as Britain increased pressure on Tehran over the capture of 15 military personnel in a crisis that has rattled global markets.
A market rumor -- denied by both Washington and London -- that military operations were under way in the Gulf sent oil prices briefly up by $5 overnight to more than $68 a barrel before they settled back at around $64.
Britain was expected to unveil evidence on Wednesday to show the 15 British sailors and marines, captured last week by Iranian gunboats near the waterway that separates Iran and Iraq, were in Iraqi waters.
Turkish Prime Minister Tayyip Erdogan was quoted as saying Turkish diplomats may be allowed to see the captured Britons