An explosion occurred Thursday in downtown Oslo but there were no reports of injury, the Norwegian news agency reported.

A bomb squad specialist works at the site of a damaged bookstore after an explosion at an adjacent jewellery store in Oslo December 30, 2010.  (Xinhua/Reuters Photo)
The blast destroyed a jewellery store and damaged other nearby stores and apartments

Fire fighters and bomb squad specialists rushed to the spot and and investigation has begun.

Also on Thursday, an explosion hit a courthouse in central Athens, causing extensive damage but no injuries and another blast occurred outside the Greek embassy in Buenos Aires, again causing no injuries.

VietNamNet/Xinhuanet