A man stole blood after he donated at the LifeSouth Community Blood Center's mobile laboratory at Providence Main Street on Tuesday evening.
The technician said the man walked out of the blood mobile after donating a pint of blood and got into his car.
He then walked back into the mobile lab, claiming he left his identification inside. That's when he stole the blood.
Workers said the man wasn't armed, but he appeared agitated.
They weren't able to identify the suspect, but they did get the man's license plate number.
No one was injured in the robbery.
LifeSouth District Director Jason Hodges said this wasn't something they planned for, but now they will be prepared if it happens again.
Investigators didn't say whether it was his own blood that he stole.
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