More than a dozen people have been hospitalized after gunfire erupted at Bunny Friend Park in New Orleans’ Ninth Ward on Sunday night, The Guardian reports. Police officers had just arrived to break up a large crowd.

Police spokesman Tyler Gamble said that 10 people were taken to local hospitals in ambulances and at least six others in private vehicles. reports that some 300 people were gathered in the park for an after party, following the Nine Times Social Aide & Pleasure Club’s annual second line:

Three witnesses said they saw a man with a silver-colored machine gun head toward Louisa Avenue. They also heard more gunshots coming from within the crowd as he ran away.

New Orleans police officers had been monitoring the second line, but witnesses say they were beginning to disperse as the after party kept going. As soon as gunshots were heard, however, officers were on the scene immediately, witnesses said.

Gamble told the Associated Press that there was another group of people in the park, in addition to the revelers, filming a video there without a permit.

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