At least two people died and 14 others were injured in a shooting in Rochester (New York).
This was reported by some American media.
According to preliminary information, a gunman opened fire at a garden party with more than 100 people shortly after midnight on Friday.
No arrests have been made at the moment.
The victims are two young people, a girl and a boy, between 18 and 22 years old, but the details have not been disclosed.
Interim Police Chief Mark Simmons said officers arrived at the scene after the 911 alarm, around midnight local (6 am Saturday, Italian time), found themselves in front of a "chaotic scene" with several victims.
According to Simmons, it is still too early to say whether one or more people were shooting.
More details about the shooting will be released at a press conference scheduled for this morning.