PHILADELPHIA (WPVI) -- A man has been arrested and charged with three counts of murder in connection with a mass shooting in the Grays Ferry section of Philadelphia last month that police say was a result of 'contagious gunfire.'

Police served a search warrant in the West Philadelphia area on Wednesday and arrested 22-year-old Terrell Frazier.

Along with the murder charges, Frazier is also charged with nine counts of attempted murder and other offenses.

But police are still looking for at least a dozen more shooters after finding 13 separate guns and 140 pieces of ballistic evidence at the scene.

"This arrest is not the end of this investigation," said Deputy Commissioner Frank Vanore, with the Philadelphia Police Department. "There is a lot more work to do."

The shooting happened ju

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