COLORADO SPRINGS, COLO. -- Colorado Springs Police are investigating a Sunday night robbery.

Two officers were patrolling the area of the 200 block of North Murray at around 10:30 p.m., when they were flagged down by the victim.

The victim told police he was on Lionstone Drive delivering a pizza, when he was approached by the suspect.

The suspect displayed a knife and demanded all of the victim's money, police said.

The victim says he then ran away but the suspect caught up with him and demanded money and the victim's car keys. The victim complied and the suspect fled on footthrough the apartment complex located at 210 N. Murray Blvd.

The suspect was described as a 6-foot tall black male, wearing all dark clothing, a black beanie cap and white shoes.

Police searched for the suspect but were unable to find him.