21 arrested on drug charges during Boston Calling festival

Boston police arrested 21 people on drug charges and assisted one person who had taken the nightclub drug Molly at this weekend’s Boston Calling concert in City Hall Plaza, police said.

Five civil citations were also issued, and 10 people were transported to the hospital, police said.

One of the 10 people transported had been on Molly, the street name for a pure form of the drug ecstasy.

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Police suspect Molly was responsible for a death after an Aug. 28 House of Blues concert and two deaths at a New York City concert from the evening of Aug. 31 into the morning of Sept. 1.