President Jacob Zuma on Sunday extended his condolences to Norway following attacks on the country, the department of international relations and cooperation said.

Zuma said he "learnt with shock, disbelief and sadness of the bombings in the heart of Oslo and the subsequent shootings at a Youth Camp, resulting in the death of scores of people."

On Friday, Anders Behring Breivik, 32, was arrested following the twin attacks in Oslo and Utoeya island which left 93 people dead.

"Our thoughts and prayers are with you in this time of mourning and sadness," Zuma said in a statement.

International department spokesperson Clayson Monyela said the government condemned all forms of attacks on its "historical Norwegian friends".

He said after official correspondence with its mission in Oslo the department confirmed no South African citizens were hurt or killed in the bombing and the shooting.

"It is our government's wish and hopes that those responsible will be brought to book and face the full might of the Norwegian law," Monyela said.

The Congress of South African Trade Unions also sent their condolences on Saturday, adding that there could "never be any conceivable justification for the murder of innocent people".

"We demand that the perpetrator is brought to justice and punished with the full force of the law," spokesperson Patrick Craven said.

People looking for information on relatives in Norway could contact the department at (012) 351-1000.