6 dead from apparent heroin overdoses in Philadelphia

KENSINGTON, Pennsylvania -- Philadelphia police are investigating after six people died from heroin overdoses Sunday.

Sources tell sister station WPVI the overdoses started sometime in the evening, with the latest around 8 p.m. on East Indiana Avenue.

Five of the six victims were in Kensington, police say, only blocks away from each other.

Here's what we know about the victims:

-A 24-year-old man overdosed on the 3000 block of North Broad Street

-A 42-year-old man overdosed on the 3300 block of Kensington Avenue

-A man in his 30s overdosed on East Indiana Avenue

-A woman in her 30s overdosed on the 3300 block of Amber Street

-A man in his 40s overdosed on the 2800 block of D Street

-A man in his 40s overdosed on the 3300 block of Kensington Avenue.

Police say they have been investigating a "bad" batch of the drug that has been circulating through the city.

A cluster of overdoses can occur when heroin is cut with toxic chemicals like fentanyl or rat poison, police say.