A 65-year-old man who was knocked off his bicycle by three teenagers on a Pennsylvania trail shot two of them, killing one, police said according to reports.

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The Reading Eagle newspaper said the wounded teen, 16, was taken to hospital and the third, age 15, was taken in for questioning and was later sent to a youth center.

The paper said the mother of the slain boy, 16, asked officials not to release his name until she had been able to tell other members of the family what happened.

The incident happened on the Thun Trail near a bridge over the Schuylkill River, between Reading and West Reading around noon Wednesday. According to WGAL.com, police said the boys knocked the man off his bicycle in an apparent robbery attempt.

"There was one juvenile who was shot and is deceased [and] another juvenile who was shot and is in surgery," Police Chief Jed Habecker said, according to a report by the WFMZ-TV station.

According to police, the 65-year-old was riding his bicycle when the teens knocked him to the ground, the station said.

Police said two teens then assaulted the man, who drew his gun and shot them.

The man was released by police after they consulted with District Attorney John Adams late Wednesday, WFMZ reported.