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SALT LAKE CITY — Prosecutors have asked the FBI to join an investigation into the rough arrest of a Utah nurse after video of her being dragged screaming from a hospital drew widespread condemnation, authorities said Thursday.

Salt Lake County District Attorney Sim Gill is overseeing a criminal investigation into officers involved in the handcuffing of nurse Alex Wubbels. He is asking for FBI help in part because his office can't prosecute possible civil rights violations like wrongful arrest, Gill said.

"This is a very important issue, and it's of great concern in our community," he said. A federal probe could also look for any larger systematic problems that contributed to the arrest, Gill said.

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The FBI opened its own civil rights review after the video surfaced last week and has agreed to assist the county investigation, FBI spokeswoman Sandra Yi Barker said.

Wubbels was following hospital protocol when she calmly refused to allow a blood draw on an unconscious patient without consent or a warrant on July 26. The patient had been injured when he was hit by a truck fleeing from police.

Related: Utah Nurse Arrested in Blood Draw Says Police Must Gain Back Confidence

Salt Lake City police detective Jeff Payne insisted on drawing the blood, maintaining in his report that he wanted the sample to protect the man rather than prosecute him. He was supported by his supervisor, Lt. James Tracy, who said the nurse could be arrested if she didn't agree.

The dispute ended with Payne handcuffing Wubbels and dragging her outside while she screamed that she'd done nothing wrong. She was later released without charge.

Payne, who has worked for the department for over 20 years, was put on paid leave by Salt Lake City police after the video emerged. A second officer also put on leave has not been identified, but police have said Tracy's actions are also under review.

Neither Payne nor Tracy could be reached for comment Thursday. The Salt Lake police union didn't return messages seeking comment.

Payne has also been fired from his part-time job as a paramedic following comments he made on the video about taking transient patients to the hospital as retaliation.