The 16-year-old male wanted for knocking out a 60-year-old SEPTA rider on the 15th Street Market-Frankford El platform on Monday surrendered to police and was charged in the attack Thursday afternoon, officials said.

The teen turned himself in to police at the 9th District around 2:30 p.m., according to SEPTA spokesman Andrew Busch.

The teen has been charged with aggravated assault, simple assault and reckless endangerment, Busch said.

SEPTA officials announced late Wednesday that SEPTA police were working out the arrangements with the 16-year-old's attorney.

Thomas J. Nestel III, SEPTA's police chief, said Tuesday that the incident started inside an El train car headed to Center City and escalated into the attack at 3:15 p.m.

SEPTA police released video of the incident with the hope of identifying the parties involved.

The victim suffered a broken jaw and needed stitches for an open wound.

With help from two tipsters, along with facial-recognition software, police were able to identify the teen and issue a warrant for his arrest.

The Philadelphia District Attorney's Office approved a warrant for the teen's arrest Wednesday night, and the teen's attorney began negotiating the terms of surrender.