JACKSONVILLE, Fla. -

A person taken into police custody after a traffic stop downtown early Thursday morning was hospitalized for a medical emergency, according to the Jacksonville Sheriff's Office.

It happened about 4 a.m. on Kings Street near the Ritz Theatre. Police say a police officer working off-duty at a secondary job noticed someone acting suspiciously.

"He was creeping around behind a closed businesses, acting suspicious, tried to avoid the officer," said JSO Lt. Daniel Kenney.

"As the officer approached the vehicle, the driver told him he had no driver's license," said Chief Adam Brown, head of the detective division. "He was also fidgeting something in between the front seats of the car."

The suspect was placed in the back of the patrol car while the officer searched the vehicle.  Finding nothing, the officer returned to find the suspect in have convulsions.

Jacksonville Fire-Rescue was called and the man was taken to UF Heath Jacksonville, where doctors say his condition was not life-threatening. JSO said the hospital is trying to figure out what caused the man's medical emergency.

"I can tell you there was no force used at all," Brown said. "There was no pursuit or fight or any type of force whatsoever."

A woman who was in the car with him was at the hospital waiting for him. Police say she does not face any charges.

This man's name and the charges against him have not been released.