Alejandro Alvarez, 32, is suspected of attacking a woman in Whittier, California on Wednesday afternoon.
Authorities responded to reports of a suspected attempted murder at around 3pm local time (11pm BST).
When officers arrived, they found a woman suffering from traumatic injuries they believe was inflicted on her with a chainsaw.
Authorities believe Alvarez is still armed and dangerous.
Anybody who has seen him or knows of his whereabouts is urged to contact the police.
Alvarez is a resident of Whittier and is driving a stolen 2004 Mercury SUV car.
More to follow...