KUNA - Multiple agencies fought a brush fire southwest of Kuna on Thursday.

The Bureau of Land Management said the Murphy Lane Fire was burning grass and brush near Kuna Butte. The fire was estimated at 290 acres Thursday evening. It was reported at about 3 p.m.

As of around 6:40 p.m., the BLM said the fire was 80 percent contained, with full containment expected by 11 p.m.

The Ada County Sheriff's Office said the fire started north of Kuna Cave Road between Robinson Boulevard and Swan Falls Road, and was moving southeast toward Kuna Cave Road. People were asked to avoid the area.

The BLM said crews from their agency were assisting resources from departments including Nampa, Murphy and Kuna. The fire is under unified command by the BLM and Kuna Fire Department.

By early Thursday evening, crews were reporting good progress on the fire.

Air resources were assisting ground crews to attempt to keep the fire from spreading. Bucket drops were being performed by helicopter, and planes were dropping retardant.

There are several homes in the area, but BLM Fire Information Officer Jared Jablonski said there was no immediate threat to them. There were no evacuations in place.

Investigators are still trying to determine the cause.

This is a breaking story, and KTVB has a crew at the scene. Check back for updates.