Seattle Airport incident: Witnesses report truck smashing into airport departures

Multiple people have been injured after a truck reportedly crashed into pedestrians outside an airport.

The incident at Seattle-Tacoma International Airport in Washington appears to have been an accident and not intentional, officials told ABC News.

Police are at the scene investigating the incident. The crash occurred at around 2pm local time (10pm BST).

The airport confirmed in a post on Twitter earlier that the Port of Seattle Police Department and Fire Department is responding to a vehicle accident on the upper drive of the airport.

Three people have been injured and transported to area hospitals, they said.

It was noted that the upper drive will be closed for an "undetermined amount of time" while people were warned to use alternate access options.

A witness posting on Twitter with the name Dan Schulz (@DanSchulz) said: "A truck ran into the airport as I was standing there."

They added: "The cops were there in a few seconds. I saw a guy laying in the rubble of one of those outside luggage kiosk things. It happened right around door 26 of departures in front of Alaska."

Seattle-Tacoma International Airport's official Twitter account tweeted earlier tonight: "A vehicle collision has occurred on the Upper Departures Drive. Port of Seattle Police and Fire are on scene.

"The Departures drive is currently closed. Please use the Lower Arrivals Drive for drop off. We will provide an update as we have more info."

In an update 15 minutes later, they added: "Port of Seattle PD and FD have responded to a vehicle accident on the upper drive. Three people have been injured and transported to area hospitals.

"The upper drive will be closed for an undetermined amount of time. Please use alternate access options."

ABC News reporter Alex Stone tweeted: "Officials tell ABC News incident of vehicle into pedestrians at Alaska Airlines departure level at SeaTac Airport appears to have been an accident and not intentional.

"Three people injured and sent to hospitals. Police are interviewing people to understand more."

Seattle Airport added in a tweet tonight: "The incident on the upper drive appears to be an unintentional act. Port of Seattle Police continue to investigate at the scene.

"The 4th floor of the SEA Airport parking garage is open for passenger pickup and drop off. Please follow posted signage to parking garage. You can also enter the garage from the south entrance at 182nd St."