BUFFALO, N.Y. (AP) — Authorities say a white, 18-year-old gunman in military gear who was livestreaming with a helmet camera opened fire with a rifle at a supermarket in Buffalo, New York, killing 10 people and wounding three others.

Here’s what we know: Officials say they are investigating the shooting Saturday afternoon as a racially motivated hate crime.

Authorities say 11 victims are Black and two are white.

Payton Gendron, of Conklin, New York, has been arraigned on a murder charge.

Authorities have not commented on a document that purports to outline the attacker’s racist, anti-immigrant and antisemitic beliefs.