By CBS3 Staff

PHILADELPHIA (CBS) — Police are investigating a second triple shooting in West Philadelphia Saturday. The triple shooting happened on the 5900 block of Lansdowne Avenue around 7:30 p.m. — just four blocks from a triple shooting that left 2 men dead and a toddler injured earlier this afternoon.

The gunmen were targeting a high school graduation party.

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Police say a 21-year-old man was shot twice in the back and was transported to an area hospital. A 36-year-old woman was shot once in the calf, she was also transported to an area hospital.

An 18-year-old also suffered a graze wound to the back of the head and was transported to Presbyterian Hospital by police.

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Police say at least 50 shots were fired.

All three victims have been placed in stable condition.

Detectives say a person of interest is being questioned and preliminary.

They do not believe the triple shooting just a few blocks away is connected, but an investigation is ongoing.

No further information is available at this time.

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Stay with CBSPhilly.com for updates to this developing story.