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Nobel Peace Prize laureate and Colombian President Juan Manuel Santos and his wife Maria Clemencia Rodriguez arrive at Oslo airport

Nobel Peace Prize laureate and Colombian President Juan Manuel Santos and his wife Maria Clemencia Rodriguez arrive at Oslo airport, Norway, December 9, 2016. NTB Scanpix/Terje Pedersen via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. 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