Exclusive - From cyber unit to troops, South Korea adds extra layer of Olympics security amid tensions

FILE PHOTO: An ice sculpture of the Olympic rings is illuminated during the Pyeongchang Winter Festival, near the venue for the opening and closing ceremony of the PyeongChang 2018 Winter Olympic Games in Pyeongchang, South Korea, February 10, 2017. REUTERS/Kim Hong-Ji/File Photo

SEOUL (Reuters) - Rattled by rising tensions with North Korea, South Korea is taking extra measures to try to ensure the safety of the 2018 Winter Games, including setting up a crack cyber defence team and doubling the number of troops, according to officials and documents reviewed by Reuters.

The Games take place next February in the mountainous resort town of Pyeongchang, just 80 km (50 miles) from the heavily fortified border with North Korea.