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Officials arrested a person on suspicion of arson Monday after several small fires were set in the Crestline area.

Firefighters work to contain flames allegedly set by an arsonist in the San Bernardino Mountains on May 1, 2017. (Credit: Tyronne Johnson)

Crews were working to extinguish a group of three blazes first reported just before 9 p.m. The fires ranged between a half-acre and 3 acres in size, according to updates posted on the San Bernardino National Forest’s Twitter account.

Highways 18 and 138 were both closed as a result, San Bernardino sheriff’s Lt. Sarkis Ohannessian tweeted.

The group of blazes was being referred to collectively as the Bridge Fire due to the location of the fires near the Crestline Bridge.

The arson suspect, who had been considered armed and dangerous, was detained around 11 p.m., Ohannessian said.

By 10 p.m. firefighters had stopped the flames’ forward rate of spread, and about 15 minutes later only two fires remained after one was extinguished below Highway 18, the agency said.

At 11 p.m. crews were getting a handle on the flames, according to Ohannessian.