A man was stabbed this morning while riding on SEPTA's Broad Street line subway, police said.

Around 10:52 a.m., a 21-year-old man was stabbed once in the stomach by a 20-year-old man on the train, police said.

Passengers notified the train operator that a fight had occurred and Philadelphia and SEPTA police met the train at the Ellsworth-Federal station, according to a SEPTA spokeswoman.

The victim was taken to Temple University Hospital, where was listed in critical but stable condition, the SEPTA spokeswoman said. A motive for the argument and stabbing is not yet known.

Service was single-tracking around the station until 12:12 p.m., when normal service resumed, according to SEPTA.