A Texas man was arrested after police say he commandeered an ambulance at knifepoint and reached speeds of 70 mph along city streets before crashing into a fence.

Investigators say the emergency lights were flashing as 29-year-old Kenneth Golightly of Fort Worth sped away Wednesday after ordering two EMTs from the ambulance.

Police say the two workers initially ignored Golightly when he approached them as they were completing paperwork. Then he pulled the knife.

The ambulance was heavily damaged after striking the fence and stopping. Golightly fled, but he was later apprehended when a witness directed officers to him.

He remains in custody Monday on a charge of aggravated robbery, with bond set at $20,000. Online jail records did not indicate he has an attorney to comment on the case.