BOISE -- A fire shut down part of Idaho Highway 21 Friday afternoon and had firefighters scrambling.

The Hammer Fire began burning near Idaho Highway 21 and East Warm Springs Avenue around 5:00 p.m., and moved very quickly through the dry grass burning around 50 acres.

Boise City, BLM, Eagle and Meridian fire crews responded with a brush truck, fire engines, structure protection, two helicopters, and one dozer.

The fire closed parts of Idaho Highway 21 for around an hour to allow all those crews to move quickly about the scene.

Fortunately, firefighters were able to knock down the active flames rather quickly, but they were nervous for awhile.

There was a couple of structures closer to Lucky Peak off of Highway 21 that they did do some structure protection on initially. Just in the event that the fire made it to them, said Mallory Eils with the Bureau of Land Management Boise District.

Firefighters were able to contain the fire around 8:30 Friday night, but have four engines currently overhead to watch the area on Saturday.

Boise BLM says investigators are still trying to figure out what caused the fire.

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