Belgrade emergency hospital spokeswoman Nada Macura said the 60-year-old man identified only as Ljubisa B. used a gun to kill six men, six women and a child. Macura says the man than tried to kill himself and his wife, who both remain severely injured.
The apparently random killings happened in the village of Velika Ivanca, some 50 kilometers (30 miles) southeast of Belgrade.
Macura says that the killer was apparently not a deranged person.
Police are investigating.