OSLO: Norwegian police said Wednesday three brothers had been arrested on suspicion of a “terrorist bombing” over a weekend explosion at the US embassy in Oslo, which caused minor damage but no injuries. Police prosecutor Christian Hatlo told a press conference the brothers, who were Norwegian citizens of Iraqi origin, had been arrested in Oslo and that police were investigating the motive. “We are still working from several hypotheses. One of them is whether this is an order from a government entity,” Hatlo said.

Norwegian police say their investigation so far shows Sunday's blast was caused by an improvised device.

Oslo, Norway, police have released images of a person suspected in the bombing outside the U.S. embassy in the city on Sunday that did minor damage.