SEATTLE (AP) — The Seattle fire chief says four people died at the scene of a crash involving a charter bus, an amphibious tour vehicle and two passenger cars.

© Seattle Fire Department The scene of a collision between a charter bus and a Ride The Duck tour vehicle on the Aurora Avenue Bridge in Seattle.

© Seattle Fire Department The scene of a collision between a charter bus and a Ride The Duck tour vehicle on the Aurora Avenue Bridge in Seattle.

Chief Harold Scoggins said at a news conference Thursday that 12 were critically injured, higher than previously reported. Many others received minor injuries.

Seattle Mayor Ed Murray says there were foreign students on the charter bus. Murray says efforts were being made to contact their consulates, but he had no other details.

Murray called the incident a “terrible tragedy.”