Detectives investigating three drug related deaths in Sheffield in the space of a week say there have been no more reported since then.
Last week South Yorkshire Police revealed a probe had been launched into three deaths believed to be linked to heroin.
A 36-year-old woman from Gleadless, a 47-year-old man from Sharrow, and a 54-year-old man from the city centre, who were all known to be drug users, were found dead in their homes last week.
The force said inquiries were focusing on whether there were any links between the trio, and where they got their drugs.
They warned other drug users that there may have been a deadly strain of heroin circulating in the city.
But yesterday a South Yorkshire Police spokesman said no other deaths concerning Class A drugs had been reported to the force since then.
Superintendent Colin McFarlane, of South Yorkshire Police, who issued the original warning, said at the time: “It is entirely possible these deaths are a tragic coincidence.
“However, we cannot rule out the possibility they may be linked to the same batch of heroin or to users mixing different drugs.
“I would urge drug users to be especially vigilant.”