State health officials say two more overdose deaths related to fentanyl-laced heroin during April have been confirmed.

The Office of the Chief Medical Examiner said Friday that the deaths occurred April 2 in Millsboro and April 5 in Claymont.

The Delaware Department of Health and Social Services says March 20 and April 5, eight people have died from fentanyl-tainted heroin overdoses. During a 2006 outbreak of similar overdoses, officials say there were seven deaths in Delaware.

The Centers for Disease Control and Prevention says fentanyl, a synthetic painkiller, is mixed with heroin to produce a stronger high. Heroin laced with fentanyl has been blamed for dozens of deaths around the country.