Emergency services responded to a distress call about a sinking boat near Bjerkøya in the Oslofjord.

The incident involved a boat with four people on board, which reportedly collided with a sea marker.

One person is critically injured and has been airlifted to the hospital, while another is seriously injured.

Two others, including a child, have been taken to the hospital with minor injuries.

The boat has been secured and transported to land.

Authorities are investigating the cause of the accident, with initial reports suggesting a collision with a submerged rock or marker.