It was a traumatizing ride for dozens of people on board SEPTA's Route 15 bus when police say a man pulled a gun from his bag and started shooting at passengers.

Four children were shot and wounded on a SEPTA bus after an altercation Saturday evening, according to transit officials. The Route 15 bus was at 33rd and Girard Streets in Fairmount Park when an adult fired at the children and fled the bus at around 6:20 p.m., according to John Golden, a senior press officer at SEPTA.

The shooting took place during an argument between a passenger and a group of teenagers on board the bus on Saturday, May 10, according to reports