Cellphones were taken from three people in three separate incidents in the District within three hours one afternoon this week. Two robberies happened on the street and one took place in a restaurant, police said, and arrests were made in the first two.

The first robbery occurred about 3 p.m. Monday in the 1800 block of A Street SE as the victim was walking east, in the direction of the D. C. Armory. Six teenagers approached, police said, “and inquired as to what type of audio device he was listening to.”

Then, police said, one of the six showed a knife and took the victim’s wallet, coat and cellphone. Officers arrived and took two people into custody. Police said the victim received minor bruises.

About two hours later, and about two miles to the west, a woman was approached in the 1100 block of Fourth Street SW, near the Arena Stage theater. Two people tried to talk to her, police said, and when “she rebuffed” them, they grabbed her cellphone.

Police said they made one arrest and retrieved the phone.

The third robbery occurred about 5:45 p.m., when two people entered a fast-food restaurant at South Capitol and I streets SE. They pulled out a knife, took a cellphone and ran away after pushing the victim to the ground, police said. They said the victim was left with a minor cut on his face.