The gathering happened along a stretch of St. Mark's Place between Avenue A and First Avenue in the East Village.
New York Governor Andrew Cuomo reacted to the incident via Twitter.
New York City bars and restaurants are set to reopen outdoor dining in Phase 2, which is likely several weeks away.
MORE CORONAVIRUS COVID-19 COVERAGE
abc7NY Phase Tracker:
COVID-19 Help, Information. Stimulus and Business Updates
UPDATES
New York City
New Jersey
Long Island
Westchester and Hudson Valley
Connecticut
REOPENING INFORMATION
What's Open, What's Closed
Reopening New York State
Reopening New Jersey
Reopening Connecticut
RELATED INFORMATION
Share your coronavirus story with Eyewitness News
Stimulus check scams and other coronavirus hoaxes
Centers for Disease Control and Prevention on coronavirus
Total count of NYC, Long Island COVID-19 cases based on patient address