Crash involving three semi trucks halts traffic on westbound 210

Some drivers already struggling to adapt their morning routes to accommodate the recent five-day closure of the westbound I-210 were still forced to suffer through traffic Thursday, after a collision involving three big rigs blocked traffic in Claremont.

The crash was first reported at around 3:50 a.m. near the Towne Avenue off-ramp.

The circumstances leading up to the crash are not yet immediately clear, though California Highway Patrol officers issued a Sigalert at 4:22 a.m. for at least 90 minutes. That Sigalert was extended to last for an additional three hours due to the extensive amount of cleanup at the scene.

According to CHP, at least one of the big rigs was believed to have overturned during the incident. 

At least one injury was reported; that person was taken to a hospital with unknown injuries.

One other vehicle was involved in the collision. 

This is a developing story. Check back for details.