OAKLAND, Calif. (KRON) — Traffic was backed up on Interstate 580 on Tuesday afternoon due to three brush fires in the area, according to California Highway Patrol and the Oakland Fire Department. OFD said no structures were threatened by the fires.

The two-alarm incident was near 35th Avenue and Delaware Street, which is near I-580. CHP shut down three lanes on westbound I-580 near Coolidge Avenue as firefighters battled the fire.

As of 7:05 p.m. OFD considered the incident under control. Multiple lanes of westbound I-580 remained closed between the 35th and Coolidge/Fruitvale exit, according to OFD.

OFD said it believes the fires were a case of arson. There was a fire in the same vicinity last week that is under investigation.

This is a developing story. Stick with us for updates.