Interstate 35 in Fort Worth is closed after a three-vehicle crash caused an 18-wheeler truck and another vehicle to catch fire, leaving nine people injured.

The crash happened Thursday afternoon on southbound I-35 near Golden Triangle.

Nine people are reported injured, according to Medstar. Two people were taken to the hospital with non-life threatening injuries. Five more were treated at the scene. One is believed to be critical, and another is in serious condition.

• Aerial photos: The scene of a fiery 18-wheeler crash on FW overpass

Southbound lanes of I-35 will remain closed for a while, and drivers should find an alternate route.

Northbound lanes are expected to reopen soon, officials said.

• Link: WFAA Traffic updates

Check back for more on this developing story.