TUCSON - An investigation has been launched after an individual stole a Tucson Fire Department pick-up truck in midtown Tuesday evening.

According to TFD, emergency crews responded to a medical emergency near Stone Avenue and Speedway Boulevard at around 7 p.m. Tuesday. While the crews were attending a patient, who was said to be a vulnerable adult, an unknown community member reportedly stole one of TFD's responding pick-up trucks after a crew member left the vehicle open with the keys inside.

"During many emergency calls, seconds can mean the difference between life and death," the department said in a statement. "Our crews on-scene were doing their part to help a member of our community."

Authorities said the truck was tracked down and later found undamaged. TFD said nothing was stolen from the vehicle.

Tucson Police Department is currently investigating the incident.

Anyone with information is advised to call 88-CRIME.