Authorities say two of the three people killed in a shooting outside the largest casino in Reno, Nevada, were 23-year-old men in town celebrating a bachelor party.

Two men in town for a bachelor party and a local man driving through a parking lot were killed in Monday morning’s shooting outside a resort and casino in Reno, Nevada, police said.

Several victims of a mass shooting at a Reno casino this week were Southern California residents attending a bachelor party, according to friends.The violence began just after 7:30 a.m. Monday, when police say the unidentified gunman walked through a parking lot from the north and emerged in the valet area of the Grand Sierra Resort.