Authorities say the ambulance struck Zhan while he was in a crosswalk. The operator of the ambulance remained at the scene.

The crash remains under investigation.

The truck is powered by a 345 cu-in V8 motor that was rated at precisely 196.7 hp and 309 lb-ft of torque, which is a lot of power for 1970. The “All Wheel Drive” label does not refer to a computerized AWD system of today’s trucks. It simply means that you can lock the hubs and make it so all wheels on this truck are driving it when 4×4 is selected.

The truck has no regular radio or air conditioning, but every feature works, including the strobe lights and the sirens. This truck is a true time capsule from the 1970s.

The volunteer firefighters in the tanker truck were David Boutcher, 36, of Vanleer; Michael Bunn, 28, of Cumberland Furnace; and Jessica Leege, 24, of Vanleer.

The THP report states that Boutcher, the driver, and Leege had been drinking alcohol.

The 2008 Kenworth T-370 tanker was traveling west on Highway 49 when it "failed to negotiate a curve to the right and ran off the road on the left side," according to the THP report.

The truck overturned and came to a final rest in the ditch.

Boutcher told the THP trooper that the air brakes "had not built up enough air and did not work at the time of the crash," the report states.

Charges are pending, according to the THP.

While the tanker was traveling to the fire scene, a Vanleer Volunteer Fire Department crew was already fighting the fire, said Vanleer Fire Chief Scotty Ingham.

“The house unfortunately was a total loss,” said Ingham about the home located on Highway 49 West near Jarman’s Market.

Also providing mutual aid were other local volunteer organizations Cumberland Furnace and Sylvia-Yellow Creek fire departments and Dickson County Fire and Rescue, Ingham said.

He also admitted using marijuana and cocaine in the days and hours before the wreck, according to charges filed Monday. He was charged with two counts of criminal vehicular homicide in Anoka County District Court and remains jailed ahead of a court appearance Tuesday.

Johnson was among nine firefighters from the Upper Peninsula community en route to help fight the Box Canyon wildfire in Utah when the truck "struck the median cable barriers, and rolled" at 3:08 p.m. Saturday, according to a State Patrol statement.

Alan Swartz, 25, and James Shelifoe Jr., 23, also of Baraga, were killed. The others on the truck survived their injuries. Two other vehicles that were part of the contingent were not involved in the wreck.

A witness traveling in the same direction told authorities he estimated their speed at 80 to 90 miles per hour in the 70 mph zone and had noticed Johnson's truck swerve multiple times.

The passengers were members of the Beartown Firefighters, a crew that specializes in fighting wildfires and is run by the Keweenaw Bay Indian Community and the Bureau of Indian Affairs.

According to the charges, Johnson told officers that he woke up late Friday morning and for the next 28 or so hours had only a 45-minute nap.

Johnson believes "he fell asleep and woke up to his passenger yelling at him as he veered off the road" near 95th Avenue, the complaint read. Toxicology test results are pending.

As soon as the community learned of the crash, the families of the injured were sent to the Twin Cities to be with their loved ones, said Tribal President Chris Swartz, who is a relative of Alan Swartz.