EDMONDS — Investigators are working to determine what caused a U-Haul van to explode Tuesday in Edmonds.

Early Tuesday morning, the van was parked in the Edmonds Center for the Arts parking lot while the driver worked at the church across the street, authorities say.

At 11:25 a.m., it exploded.

There were no injuries, but one nearby car window shattered and the blast damaged the doors of some cars parked nearby, Edmonds Police Department spokesperson Sgt. Josh McClure said.

The van was destroyed, with the roof, side panels and other debris strewn about the parking lot.

South County Fire crews arrived quickly, McClure said, and knocked down the remaining flames.

As of Tuesday afternoon, investigators were unsure if propane tanks inside the van caused the explosion.

“They may not have been responsible,” McClure said. “We don’t have an exact cause, yet.”

Members of the Lynnwood Police Department and the federal Bureau of Tobacco, Firearms and Explosives were also assisting in the investigation.

The bang could be heard throughout town.

“It shook our building enough for us to go out and see what it was,” McClure said.

The department’s public safety building is about two blocks away from the location of the blast.

The van was mostly filled with the personal belongings of the driver, McClure said. A family member of the driver helped pack it Monday, and on Monday night the driver took the van on the Kingston ferry to Edmonds.

“It appears to be just an unfortunate accident,” McClure said. “We are very grateful that nobody was injured. All things considered, this is kind of the best case scenario, if this was going to happen.”

Joey Thompson: 425-339-3449; jthompson@heraldnet.com. Twitter: @byjoeythompson.