PHILADELPHIA, PA. (THECOUNT) — Four people were discovered shot dead execution-style in a basement in West Philadelphia on Monday afternoon, police say.

Four victims, two men and two women, were found shot and killed in a basement in the 5100 block of Malcolm Street, in West Philadelphia on Monday afternoon, police say.

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Joe Holden Via Twitter @JoeHoldenCBS3:

BREAKING: Police sources tell me they’re at the scene of a quadruple homicide. Four found shot, execution style, in a basement in the 5100 block of Malcolm Street, SW Phila.. No word on suspected shooter. @CBSPhilly source

Philadelphia police say two men and two women were found in the basement of the home with one gunshot wound each to the head.

The victims have not yet been identified.

No arrests have yet been made and no weapon has been recovered.

Developing.