Key Facts

• An explosion occurred at the US embassy in Oslo, Norway, on Sunday.
• No injuries were reported, but the explosion caused minor damage.
• Three brothers, Norwegian citizens with links to Iraq, were arrested.
• The explosion is believed to have been caused by an improvised device.
• The suspects are being investigated for possible terrorism.
• Police are exploring different motivations, including potential foreign state involvement.
• Images and a now-deleted video involving Iran's former leader are part of the investigation.
• Emergency services, including dogs and drones, thoroughly examined the site.