The vehicle was running on idle parked after being driven and on for less than 20 minutes. I started the van at 8:35. Drove away at 8:41, let it run on idle for 5 minutes, drove away, let it idle for 2 minutes at 9:04, drove away, let it idle at 9:06 and was smoking and had flames by 9:23 when we noticed it. The heat gauge didn't change, there was no indication that my engine was on fire or there was any issue. It drove fine, no smell, nothing. We have zero idea what happened other than it started in the engine compartment. Is it currently still sitting in the parking lot that it was pushed to away from the building as to not cause more damage to the building. It was sitting outside a building, so everyone inside and outside were in the area of smoke and flames. There is not a police report, but there is a fire report. I can email that over if needed. I'm still waiting for the fire marshalls final report. I also have active videos of it with flames shooting out of the engine and from under the hood if needed that I can email over.