7 People Shot, 2 Fatally, at Park in Upstate Rochester, New York

ROCHESTER, N.Y.—Two women were killed and five other people were injured when gunfire erupted during a Sunday afternoon barbecue at a park in upstate New York, authorities said Monday.

Hundreds of people were at a gathering in Maplewood Park in Rochester when someone opened fire around 6:20 p.m., police said.

“At some point, rounds were fired from multiple weapons, striking the victims,” Police Chief David Smith said at a news conference.

Tyasia Manning, 25, a city employee, was killed, police said. A second victim, Phylicia Council, 34, died later.

Several police agencies responded to the park, including the Irondequoit Police, Monroe County Sheriff’s Office, Rochester Police, and New York State Police.

Police said the gathering had been advertised with flyers. They did not specify the occasion but said the organizers were not required to obtain a permit from the city in advance.

“There were hundreds of people at this barbecue, and therefore there are hundreds of people who have potential information to help us solve this crime,” Mr. Smith said, urging those with video or information to contact police.

No suspects were in custody, police said.

Before the violence, “people were in a celebratory mood, enjoying the warm weather, having a good time,” Mayor Malik Evans said Monday.

It was the second shooting at a Rochester park in as many months.

In June, six people were wounded in an overnight shooting at Dr. Martin Luther King Jr. Memorial Park. Mr. Smith said at least one person started shooting into a crowd of people during an argument.

In that case, the shooting occurred at an unauthorized gathering when the park was closed.

Capt. Greg Bello said it was unknown Sunday how many people fired guns during the latest shooting. “We are trying to work our way through as many witnesses as we can,” he said.

Rochester is about 340 miles (547 kilometers) northwest of Manhattan.