European Union president Herman Van Rompuy on Friday denounced the deadly bombing that hit government buildings in Norway's capital as an act of "cowardice".
"I am deeply shocked by the bomb blasts this afternoon in Oslo which have killed a number of innocent people and left many others injured," Van Rompuy said in a statement.
"I condemn in the strongest terms these acts of cowardice for which there is no justification."
Van Rompuy said he sent a message of "condolences and solidarity" from the 27-nation EU to Prime Minister Jens Stoltenberg.
European parliament Jerzy Buzek expressed his solidarity with the Norwegian people over the "regrettable and despicable act."
"Norway has been providing good services for peace in the most volatile spots areas around the globe," he said.
"The last thing Norway deserves is a terrorist attack on its soil. Terrorist attacks are never justified anywhere."
A deadly blast ripped through government buildings in Norway's capital Oslo today, including Stoltenberg's office, police said, in what appeared to be the first militant bomb attack ever to hit the Scandinavian country.
The Prime Minister was safe but the attack had caused deaths and injuries, police said.