Officials on Tuesday reported a spike of opiate overdoses in the region, warning the public about an apparent "lethal, very strong batch of opiates in the area."
Three people died from suspected overdoses over the weekend in the Greater Lowell area, said Lowell Fire Chief Jeff Winward.
There have been 21 overdoses in the last week, and eight in the previous 24 hours.
Officials say that fentanyl is being mixed with heroin and cocaine, and it's being sold in pill form.
"We strongly urge people not to use opiates, but if you or your loved one is suffering from addiction, please be extra vigilant in the coming days," Winward said in a statement. "Do not use alone, and check on your loved ones frequently if they may be using opiates."