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Cross country skier Therese Johaug flanked by coach Pal Gunnar Mikkelsplass and manager Jorn Ernst during a news conference in Oslo

Cross country skier Therese Johaug (C) flanked by coach Pal Gunnar Mikkelsplass (L) and manager Jorn Ernst (R) during a news conference in Oslo, Norway April 19, 2018. Johaug, a triple Olympic medalist and seven-time world champion has finished her 18-months suspension, after testing positive in September 2016 for a steroid found in a cream given to her by a team doctor to treat sunburned lips. NTB Scanpix/Hakon Mosvold Larsenn via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. NORWAY OUT. NO COMMERCIAL OR EDITORIAL SALES IN NORWAY.

Explosion, gunman attacks rock Norway

A powerful explosion rocked a government building in central Oslo on Friday