PHILADELPHIA (CBS) — Philadelphia police are investigating a head-on crash along Roosevelt Boulevard that left six people injured.

The accident happened around 10 p.m. Saturday near Woodward Street in Northeast Philadelphia.

Police say two vehicles were involved, but it wasn’t immediately clear what caused the accident.

Two people were taken to St. Mary Medical Center where they were treated and released. A third victim, believed to be one of the drivers, was transported to Aria Torresdale Hospital in critical condition.

Authorities say the injuries to three others involved were not serious.

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