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Rescuers work at a site where a helicopter has crashed west of the Norwegian city of Bergen

Rescuers work at a site where a helicopter has crashed west of the Norwegian city of Bergen April 29, 2016. NTB Scanpix/Marit Hommedal/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. NORWAY OUT. NO COMMERCIAL OR EDITORIAL SALES IN NORWAY. NO COMMERCIAL SALES.

Explosion, gunman attacks rock Norway

January 1, 1970

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