(AP) — Officials in Worcester say a surge of drug overdose deaths in early August has appeared to ease, but heroin users still aren't safe from potentially deadly street combinations of the opiate. Worcester Police Chief Gary Gemme tells the Telegram & Gazette (http://bit.ly/1qrYRPJ) investigators have recently found heroin mixed with the powerful painkiller fentanyl, which has been blamed for a rash of heroin deaths around the country this year.