Two more people are said to be “gravely ill” following a spate of drug-related deaths in Barnsley.
It comes after three men and a woman were found dead at separate addresses on Good Friday after taking a substance believed to be heroin.
Initial tests have shown that one of the deaths was linked to a pre-existing medical condition and further tests are being done to establish the causes of death in the other cases.
The fresh reports of drug-related illnesses came in on Monday and South Yorkshire Police have said they survived only because of the “quick actions of paramedics”.
Two other bodies were found in West Yorkshire on Saturday following suspected drub abuse, but officers in Barnsley do not think that the deaths are linked.
Two men, aged 37 and 42, have been arrested on suspicion of being concerned in the supply of drugs and released on bail.
Said Chief Superintendent Rob Odell, of South Yorkshire Police: “In addition to the deaths reported to police on Monday April 17 we received two separate reports of individuals becoming gravely ill after taking suspected illegal substances.
“Thanks to the quick actions of paramedics, those individuals survived.
“I appreciate that these are concerning events and I’d urge anyone with concerns about this matter to either contact police or, if you have taken a substance and feel unwell, to seek medical support and advice immediately.
“Our absolute priority is to keep people safe from harm and to minimise any threat to life, which is why we will continue to investigate these incidents as thoroughly and as quickly as we can.”