2 dead, 5 injured in mass shooting at crowded upstate New York park

The video covers a news story about a shooting in Rochester, New York, where two women were killed and five others injured. Police responded to a BBQ at a park and are now seeking public assistance to find the perpetrators. There is uncertainty about whether the shooters were at the BBQ or outside the park.

How many people were injured in the shooting?

What happened at the park in Rochester?

What event was taking place at the park when the shooting occurred?

What were the police asking from the public?

What uncertainty did authorities express regarding the shooters?