The vehicle combines a fire engine with pumping capabilities with a ladder truck, including a 107-foot aerial ladder enabling firefighters to access the new taller buildings to be built on the nearby Facebook campus and other parts of Menlo Park.

Black River First Assistant Fire Chief Leslie R. Williams said firefighters were investigating a crash between a van and a truck when a passing motorist saw smoke coming out of their fire truck. Firefighters extinguished the minor electrical fire within minutes, Mr. Williams said.

Mr. Williams said he believes the fire was caused when a door switch failed. Fort Drum firefighters drove to the scene in case the fire was larger, he said.

“We just put it out with a fire extinguisher,” he said. “It’s actually back in service.”

More than 500 firefighters already have arrived to fight the nearly 20,000-acre fire burning southeast of Prescott Valley in Arizona. Roughly 1,400 residents of the nearby town of Mayer were forced to evacuate Tuesday, according to Arizona news reports. The human-caused fire started Saturday and has destroyed nine homes.

Twenty firefighters make up Grand Junction’s wildland firefighting team, so local officials are comfortable sending four firefighters to help, Evans said.

A drone which could deliver a defibrillator to a person suffering from a cardiac arrest is being tested by the Karolinska Institute in Sweden.

Trial flights have the shown the drones can arrive at a destination four times faster than an ambulance.