Crews work to build a firebreak to stop a grassfire northeast of Portales Tuesday afternoon.

Firefighters from around the area had a Roosevelt County grassfire 90 percent contained as of 4 p.m. Tuesday, according to Portales Fire Chief John Bridges.

The fire started earlier Tuesday afternoon.

Bridges said the fire burned about 2,000 acres of grassland, and some firefighters remained on the scene watching for hot spots.

The suspected cause of the blaze is arcing electrical lines.

Firefighters from Portales, Clovis, Arch, Muleshoe, Texico and Dora battled the grassfire, which was east of U.S. 70 and south of N.M. 202 (Cacahuate Road).