A man was shot and killed and his son wounded early Sunday in the 800 block of Elm Street, Reading police said.
When police arrived they learned an acquaintance of the victims was holding the man suspected to be the gunman nearby.
The acquaintance, 28, had witnessed the shooting and chased the suspect, yelling for him to stop, police said.
Police were first dispatched about 2:20 a.m. to Elm Street, where they found the 49-year-old victim dead on the sidewalk. They also found that his 29-year-old son had been shot in the upper torso and driven to a local hospital in a private vehicle.