Olympics - Pyeongchang-bound athletes not worried about North Korea

FILE PHOTO - Fireworks explode in the sky to mark 200 days before the 2018 Pyeongchang Winter Olympic Games in Chuncheon, South Korea, July 22, 2017. REUTERS/Kim Hong-Ji

LIMA (Reuters) - Athletes preparing for next year's Pyeongchang Winter Olympics have not expressed concerns about their safety amid an escalating crisis with North Korea, international federation chiefs said.

Regional tension has risen since the reclusive North conducted its sixth, and by far its most powerful, nuclear test on Sept. 3, following a series of missile tests, including one that flew over Japan.