ATLANTIC CITY -- Six people have died from fatal heroin overdoses in Atlantic City in the last week including two who used heroin stamped with "King of Death," police said.

The fatal overdoses prompted Atlantic City police to issue a warning about the particularly dangerous batch of "King of Death" heroin.

Police said that six people overdosed on heroin between 4 and 10 p.m. on Wednesday. Four were revived with the opiod antidote Narcan and two died. It was not clear if all the Wednesday overdoses involved the heroin with the "King of Death" stamp.

A message left for a police spokesman seeking additional information early Friday was not immediately returned.

Jeff Goldman may be reached at jeff_goldman@njadvancemedia.com. Follow him on Twitter @JeffSGoldman. Find NJ.com on Facebook.