A jackknifed tractor-trailer rig has blocked both westbound lanes of Interstate 10 at 22nd Street.
Officer Quentin Mehr of the Department of Public Safety says that traffic is backed up to the Kino Parkway interchange.
Citizen traffic cameras show at least two large trucks involved in a collision. Mehr said that up to five vehicles may be involved. The number of injuries is unknown, said the DPS spokesman.
Mehr said both lanes of westbound I-10 should be reopened by 4:30 p.m.