An NYPD truck carrying metal barricades burst into flames in Columbus Circle on Thursday morning.

The truck experienced a mechanical issue around 9:10 a.m., causing the fire to break out on Broadway near West 59th Street, according to police and fire officials. No one was injured.

“It just started smoking and they got out and that was it,” said a police officer on scene, who was not inside the truck at the time.

Michael Avon, 44, a technology executive on a business trip from Washington, DC, watched as about a dozen officers responded — with guns drawn.

“[A few of them] had their machine guns out,” he said. “They were freaked out.”

Meanwhile, security guards from nearby buildings said they had to keep people back from the flames.

“I came out here and there was a lot of smoke,” said a guard who asked not to be named. “People were trying to get close to it so they could get video … We had to keep them away.”

An occupant of the truck said he and four other workers were inside when they noticed the engine beginning to smoke.

Videos and photos posted to Twitter showed flames shooting from the truck and smoke billowing down the street.

Posts at around 9:40 a.m. appear to show that the fire had been extinguished. The FDNY confirmed that the incident was closed out by 9:56 a.m.

The front of the truck was left completely dilapidated and blown out, with the front tires melted and singed at the top. The undercarriage continued smoking even after the flames were knocked down.

The city Office of Emergency Management tweeted that drivers near Columbus Circle should “expect extensive traffic delays and emergency personnel” in the area, consider alternate routes and allow for additional travel time.