Baltimore County police said a man was found dead in Chevy Blazer in White Marsh Saturday morning.
An officer found the man unresponsive in the SUV along with three hand-written notes. The contents of the notes were not released but police spokesman Cpl. John Wachter said they prompted the officer to call for backup.
The county's bomb squad and hazmat crews responded to the SUV, which was parked in the area of Crossroads Circle and Williams Court, near White Marsh Boulevard.
"It doesn't seem like they recovered anything," such an explosive device from the vehicle, Wachter said. No buildings were evacuated.
The man's identity was not released. Wachter said there were no indications of foul play and that the medical examiner will determine a cause of death.