Two of the victims gunned down in a mass shooting at a Nevada Casino were in town to celebrate a bachelor party — and were shot in the back by a gunman whose seemingly random attack has left

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.