"In the process of treating them, they administered Narcan, well over 10 doses of Narcan between the three of them," Deputy Fire Chief John Quatieri said.
Officials found a white, powder substance on the seats after the men got out of the van. Chelsea fire then called in a hazmat team to decontaminate the scene.
The three men in the van were taken to the hospital. Two police officers were also taken to the hospital as a precaution after they reported feeling light-headed.
Exposure to fentanyl has become a constant concern for emergency responders.
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