A family house party in South Jersey turned into a crime scene where at least two people were fatally shot and 12 others were wounded, state police said.

Authorities arrived at the house in Fairfield Township, about an hour outside of Philadelphia, late Saturday night. A resident who runs a local anti-violence organisation said he was called out to assist families at the 90s-themed party. John Fuqua, of Life Worth Living, said guests who attended the party were of all ages.