BOSTON (WHDH) - Dozens of nitrous oxide canisters were collected from outside Fenway Park on Friday after a large crowd of people gathered to inhale the fumes ahead of a concert, police said.

Members of the Boston Police Department’s Drug Control Unit and the Citywide Bicycle Unit recovered 67 canisters of suspected nitrous oxide after officers noticed a large group of people inhaling the gas from balloons “in an effort to achieve a high,” according to police.

One witness said people inhaling the nitrous oxide, also known as “laughing gas,” were acting rowdy.

“It seemed like they were drunk,” said Cess Frazier. “One guy jumped in my car for whatever reason who was not supposed to get in my car … it was quite madness.”

The canisters were turned over to the Boston Fire Department’s Hazardous Materials Unit for additional processing.

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