Ann Arbor police released more information Thursday on the robbery outside the Michigan Pain Specialists Wednesday afternoon where a man was jumped by a man who had asked him for cash.

Ann Arbor police Lt. Renee Bush said the 41-year-old man was walking into the clinic, at 3500 Green Court, at about 1 p.m. when a man approached him asking for money.

The man told the victim that he needed the money for a sick family member and, after the victim gave him a dollar, he continued to pressure the victim for money, Bush said.

The victim told police that the man and a partner, who ran from the north side of the building, jumped him and began beating him, Bush said. Bystanders intervened and the men fled the area, Bush said.

The men got into a black Monte Carlo and drove away before police arrived on the scene, Bush said.

The 41-year-old man refused medical treatment at the scene, she said.

The man who originally approached the victim is described as black, about 20 years old, between 5'7" and 5'11" tall and has cornrows. The second man is described as black, between 5'2" and 5'4" tall, about 150 pounds with a dark complexion.

Police still are investigating the incident. Anyone with information on the robbery is encouraged to call 734-794-6939.

Kyle Feldscher covers cops and courts for AnnArbor.com. He can be reached at kylefeldscher@annarbor.com or you can follow him on Twitter.