ANCHORAGE (KTUU) - Update: 5:44 p.m. - All lanes of traffic both northbound and southbound on the Seward Highway are now open.
Update: 7:35 p.m. - The southbound lanes of the Seward Highway are now open. Police say the northbound lanes will remain closed until about 9 p.m. Vehicles traveling northbound are being diverted onto the Rabbit Creek Exit.
Original story 6:35 p.m. - Police are responding to a multiple vehicle collision involving an 18-wheeler near the De Armoun exit on the Seward Highway. Responding officers say there were no fatalities.
It happened shortly before 6:30 Sunday evening. Police say a vehicle driving in the Southbound lane crossed the median and struck oncoming traffic. All north and southbound lanes of the Seward Highway near the De Armoun exit are closed.
Police are asking the public to avoid the area and seek alternate routes.
This is a developing story.