Eleven people were killed late Saturday when a gunman opened fire at a house party in the Brazilian city of Campinas. The shooter, identified by authorities in Sao Paulo as 46-year-old Sidnei Ramis de Araújo, is accused of killing his ex-wife and 8-year-old son in addition to other party-goers. In addition to the 11 people killed, he also turned the gun on himself, police said. He is believed to have been upset over the split with his ex-wife. Three people are hospitalized with injuries, police said, while another four survived the shooting unharmed. Authorities were alerted to the massacre when one of the guests ran to a bathroom and called police, they said. Survivors said the shooter burst into the party and began firing, while at the same time yelling at his ex-wife, Isamara Filier, for allegedly taking away their son. Police said Araújo went in prepared for extreme violence – carrying two extra clips, extra ammunition, a knife and explosives.