PHOENIXVILLE, Pa. (AP) — Police have charged two people with killing a Guatemalan immigrant for his backpack in suburban Philadelphia.

Phoenixville police say they’re still seeking a third person in last week’s killing of 22-year-old Selvin Mamerto Lopez-Mauricio.

Investigators say 20-year-old Saleem Williams and 23-year-old Stephen Reidler accosted Lopez-Mauricio early on September 14. Chief William Mossman said Lopez-Mauricio was fatally shot after resisting an attempt to steal his backpack.

Williams and Reidler are in custody. Police say they’re looking for an 18-year-old woman they say was implicated by the suspects.

It was not clear if either man had an attorney.

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