Plainclothes police arrested two youths who attempted to rob two pedestrians at gunpoint in quick succession near 47th and Warrington and 48th and Springfield late Wednesday night.

A 59-year-old man was walking his dog at about 11 p.m. on the 4700 block of Warrington when a young man, who police later identified as a 17-year-old, jumped out of the bushes and tried to rob him, police said. The man turned to run but was met by another 17-year-old who swung at him. The older man blocked the punch, hit the young man in the face and fled. Both youths chased the man, who managed to attract the attention of several more pedestrians who came to help him. The two youths fled.

About 10 minutes later a 31-year-old male was walking near 48th and Springfield when he was tapped on the shoulder. He turned around to see a young man pointing a gun at him. The male, who police say was also involved in the first robbery, demanded that he empty his pockets. When the man said he had nothing in his pockets the young man struck him in the face with the gun and rifled through his pockets before fleeing on foot. The victim suffered a broken nose.

Plainclothes police who had been alerted to the first robbery observed the second and caught one suspect after a brief pursuit. The second suspect fled down Springfield Avenue and was caught near an alley where police also recovered a BB gun pistol.

Both defendants, whose names were not released because they are juveniles, were charged with the robberies and police say they are investigating their possible involvement in other robberies in the area involving youths in recent weeks.