A volunteer youth coach was arrested in Philadelphia and charged with the alleged sexual assault of two teenage girls, according to police.

Timothy Foster, 38, was wanted for the sexual assaults and turned himself in on Thursday. Philadelphia Police said he sexually assaulted and had an inappropriate relationship with two teenage girls, according to FOX 29.

Foster was a volunteer youth coach at the Port Richmond Tigers Sports Athletic Association.

TWO DEAD, 1 CRITICALLY INJURED AFTER SHOOTING INSIDE PHILLY TAKEOUT RESTAURANT

Timothy Foster

Timothy Foster sexually assaulted and had an inappropriate relationship with two teenage girls, police said. (Philadelphia Police)

Police said in a press conference on Friday the investigation began after a 14-year-old girl reported on Jan. 9 that Foster assaulted her. 

On Jan. 11, a 13-year-old girl also told police that Foster assaulted her.

Investigators found lengthy messages on social media exchanged between Foster and the two girls, police said.

Philadelphia police vehicle

A volunteer youth coach was arrested in Philadelphia and charged with the sexual assault of two teenage girls, according to police. (iStock)

SECURITY SHOOTS ARMED SUSPECT OUTSIDE OF PHILADEPHIA FEDERAL COURT BUILDING

Police also said some of the alleged assaults took place in Foster's home as other teenage girls were inside the residence. 

Foster was charged with indecent assault, corruption of minors, sexual assault, rape and other related charges.

Philadelphia Police badge

Foster was charged with indecent assault, corruption of minors, sexual assault, rape and other related charges. (Philadelphia Police)

CLICK HERE TO GET THE FOX NEWS APP

Police said they suspect there could be other victims and encouraged them to come forward.