Top U.S. security adviser: Iranian mines likely caused UAE tanker blasts

FILE PHOTO: U.S. National Security Advisor John Bolton speaks during a graduation ceremony at the U.S. Coast Guard Academy in New London, Connecticut, U.S., May 22, 2019. REUTERS/Michelle McLoughlin

ABU DHABI/JEDDAH, Saudi Arabia (Reuters) - U.S. National Security Adviser John Bolton said on Wednesday that naval mines "almost certainly from Iran" were used to attack oil tankers off the United Arab Emirates this month, and warned Tehran against conducting new operations.

Bolton said the "prudent and responsible" approach taken by the United States, which has beefed up its military presence in the region, had made it clear to Iran and its proxies that such actions risked a "very strong" U.S. response.