A truck dropped loads of freight on the side of a highway Monday morning in the Los Angeles area, forcing a temporary halt in the city’s rush hour commute.

At least two trucks were seen leaving the highway in the area of South Van Ness Avenue and Woodland Avenue about 3:20 a.m., a Los Angeles County Sheriff’s Department spokeswoman said.

The department sent out an alert for all commercial trucks and their trailers to avoid the area.

The area is a popular stop for drivers heading to the nearby Los Angeles Convention Center, according to the Los Angles Times.

It was not immediately clear if the truck was carrying cargo or vehicles.

The Los Angeles Times reported the truck did not have a trailer hitch, so authorities were not sure if the trailer was attached to the truck or not.

The incident is under investigation, the newspaper reported.