SAN DIEGO -  

Authorities said a 44-year-old woman who stabbed a man in the forearm during an argument in Ocean Beach and then threatened to kill a witness was in police custody Saturday morning.

The stabbing occurred just before 9:15 p.m. in the 5000 block of Newport Avenue, said San Diego police Officer David Stafford.

Stafford said the woman fled on foot, but a witness followed her.

At one point, the woman turned and threatened to kill the witness, he said.

Officers arrived and arrested the woman on suspicion of assault with a deadly weapon and making criminal threats, Stafford said.

The man who was stabbed was taken to a hospital.