Narcotics detectives from Wilkinsburg said they seized $8,000 worth of heroin from a Hill Avenue apartment Thursday night.
Investigators said they also recovered two assault rifles, five handguns, and $8,400 in cash.
Police arrested Robert Thomas, Cheron Shelton, Aymund Knight and Justin Gomez.
All four men are facing drug charges.
$8K in heroin seized from Wilkinsburg apartment; 4 arrested
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