Quadruple shooting erupts overnight in Philadelphia: police

4 injured after shooting in Southwest Philly

A quadruple shooting in Southwest Philadelphia early Monday morning is under investigation by Philly police.

PHILADELPHIA - Four young men were hurt when gunshots broke out early Monday morning in West Philadelphia.

The shooting happened hours after police say three people were killed, and nine others were hurt in a mass shooting in Grays Ferry.

What we know:

Officers from the Philadelphia Police Department were called to the 6100 block of Vine Street in West Philadelphia around 2:30 a.m. for reports of a shooting.

Police found four young men between 18-22 suffering from gunshot wounds and brought them to the hospital where they remain in unknown condition.

No arrests have been reported.

What we don't know:

Investigators have no shared information on a possible suspect. 

It's also unknown what sparked the shooting.