Mayor De Blasio gave a press conference on Sunday morning, in which he said that 100 NYPD officers were at the event when the shooting occurred.

\"I want to thank the NYPD for a swift response, which unquestionably helped to make sure that those who were struck were saved,\" the mayor said.

\"I want to make really clear this tragedy does not define Brownsville does not define the people Brownsville,\" he added.

The Old Timers' Day event has been held since 1963, and was sponsored by Council Members Inez Barron and Alicka Ampry-Samuel, who represent the area. There were about 2,000 people in attendance, according to the police source.

Samuel, who was at the event Saturday evening, tweeted in response to de Blasio, \"One of the worst experiences of my life. How does such a beautiful and peaceful event become overshadowed by tragedy in seconds? We have to do more.\"

One of the worst experiences of my life. How does such a beautiful and peaceful event become overshadowed by tragedy in seconds? We have to do more.... https://t.co/qY6uTOsMnn

— Alicka Samuel (@alickasamuel) July 28, 2019

No one has been arrested. Police are looking for two shooters who used two guns. One weapon has been recovered as of Sunday.

Brownsville is known as a dangerous neighborhood in Brooklyn, though like all of New York City, crime has declined significantly in recent decades.

As of July 21, there had been six murders in the 73rd precinct, which includes Brownsville, so far this year, according to NYPD statistics. There have been 52 murders in all of Brooklyn so far in 2019, with only the 75th precinct (7) and 79th precinct (8) having more murders than Brownsville. The 75th precinct patrols East New York and the 79th precinct patrols Bedford-Stuyvesant, both neighborhoods near Brownsville.

Police are asking for anyone who has video from the event and there during the shooting to hand it over to authorities by calling 800-577-TIPS.

ABC News' Alex Faul, Aaron Katersky and Christopher Donato contributed to this report.

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