The State Patrol says driving impaired may have been a factor in the crash.
Health officials instead will focus on high-risk settings, like schools and long-term care facilities.
The collision happened mid-afternoon on Hwy. 2 near Grand Rapids.
The man was reported missing on Sunday, Sept. 27.
Timothy Alan Dasovich was first reported missing earlier this month.
Health officials are asking those who attended to watch for symptoms.
No one was in the building at the time.
The 45-year-old victim is from Squaw Lake, Minnesota.
At least two county sheriff departments are being inundated with calls.
The State Fire Marshal documented the incident as a propane explosion.
Parts of northern Minnesota are at 50-75 percent color.
The driver is being held on suspicion of criminal vehicular homicide.
There were 32 children on the bus.
The crash happened Saturday just after 2:40 p.m.
He was last seen near Cohasset, a small town west of Grand Rapids.
The crash happened around 2:15 a.m. Saturday, May 11.