WILMINGTON (AP) — Police in a southwest Ohio community are asking for the public’s help in catching sellers of heroin blamed for 12 overdoses, two of them fatal, in less than a week in the city of some 12,500 people.

The Wilmington News Journal reports police are asking residents to call a tip line to report suspicious activity and also are looking for informants willing to testify in court.

Detective Scott Baker says investigators suspect the fatal overdoses of a man and a woman involved heroin. He says evidence of heroin was recovered at the scene of all the overdoses. Baker says there appears to be something in heroin being used in the city that is causing massive overdoses.

Baker also says some people are still trying home remedies before calling 911.