A man and a woman were robbed at gunpoint near downtown Palo Alto on Tuesday night, police said.

The victims, a man in his 50s and a woman in her 20s, were walking northbound on the 300 block of Ramona Street at about 8:30 p.m. when they were approached by a man, police said. He allegedly blocked the sidewalk, drew a black handgun, and demanded their wallets and the woman's purse.

After handing over their things, the victims were ordered to turn around and walk in the other direction, police said. They then heard the man run away northbound on Ramona Street.

The victims arrived at a restaurant on the 400 block of Emerson Street about 10 or 15 minutes after the robbery and told staff what had happened, police said. An employee called police, who searched the area but could not find the man.

The robber was described as black, in his early 20s, about 5 feet 8 inches tall and 165 pounds. He was wearing dark-colored pants and a gray hooded sweatshirt with the hood up.

No injuries were reported, police said.

Police encourage people to remain aware of their surroundings when out for walks and to immediately call 911 if they observe suspicious behavior.

Anyone with information about the armed robbery is asked to call the police department's 24-hour dispatch center at 650-329-2413. Tipsters who wish to remain anonymous can text or call 650-383-8984, or email paloalto@tipnow.org.

Email Jason Green at jgreen@dailynewsgroup.com; follow him at twitter.com/jgreendailynews.