One lane of northbound Interstate 5 at Grapevine Road has been shut down due to a trailer fire.

According to the California Highway Patrol, a big rig's brakes and trailer caught fire just before 2:30 Tuesday morning. 

The big rig was able to pull over into the right hand shoulder, but has caused the CHP to shut down the No. 4 lane. 

Environmental Health has been called to help with cleanup. 

Right now there's no word as to when the lane will be reopened.