All lanes of southbound Interstate 25 closed at 136th Avenue Wednesday afternoon due to a multi-vehicle crash.

The wreck happened near 128th Avenue, according to Thornton Police.

According to the 9NEWS Traffic Map, delays were at least 20 minutes as of 12:11 p.m. – and were increasing.

Sky9 video shows at least four vehicles involved in the wreck.

It’s unclear if anyone was injured, or what exactly caused the crash.

Drivers are encouraged to take another route if they can.