ANTIOCH: A shooting at a birthday party killed an 18-year-old woman and injured six others in Northern California early Sunday, police said.

The Antioch Police Department responded to multiple 911 calls about a shooting just before 1 a.m., the department said in a statement.

Multiple shots were fired after some people arrived uninvited at a birthday party for a 19-year-old man at a home in the city about 45 miles (72 km) northeast of San Francisco.

Victims and a large crowd were found by officers outside the home, police said.

The 18-year-old woman was transported to an area hospital, where she died, police said.

The victims who suffered non-life-threatening injuries included an 18-year-old man and a 19-year-old man, two 19-year-old women and two 20-year-old women.

Some of the victims transported themselves to area hospitals after a panic where attendees fled in multiple directions and into the neighbourhood, police said.

The Antioch police said a suspect or suspects fled the scene before officers arrived, but there were no arrests immediately reported.