A trash truck fueled with compressed natural gas burst into flame early Wednesday morning on the ramp at southbound Interstate 25 at Belleview Avenue, officials say.

No one was injured and Denver firefighters were still mopping up the truck fire at 6:13 a.m., more than an hour after the fire started, according to Denver fire Capt. Robert Lewis.

“We’re just now bringing it under control,” Lewis said.

One lane of the ramp was reopened, according to a 10:27 a.m. update by the Colorado Department of Transportation. One lane of the ramp remains closed.

When firefighters arrived at the scene the truck was fully engulfed.

Fire investigators will determine what caused the truck’s engine to catch on fire around 5:11 a.m.

There was no crash that triggered the fire, Lewis said.

Alternative routes are recommended, according to CDOT.