The cop was attempting to break up a fight involving the singer inside the Cromwell Hotel when he was hit, TMZ reported.
A spokeswoman for the Las Vegas Metropolitan Police, Laura Meltzer, said, "A man by the name Abel Tesfaye was arrested on Saturday in Las Vegas at about 4:42 AM Special Event officers responded to call regarding a fight that broke out at the 3500 Block of South Las Vegas Boulevard When they got to the venue there was a big group of people in an altercation."
"Abel was arrested for battery of a protected person and taken to Clark County Detention. He is not there anymore so he must of bailed out."
After being released, the 'Love Me Harder' crooner posted on Instagram a photo of him boarding plane in the night. "Escaped from Las Vegas," he wrote alongside the snap.