Officers say the suspect and another man follow intended victims home at night and strike when the person gets out of their car in their driveway.
There have been at least 15 victims in three different San Gabriel Valley communities since March 21 and has gotten away with several purses and wallets.
The suspect was described as a male Hispanic, between the age of 25 to 30, about 5 feet 8 inches to 6 feet 2 inches tall, medium complexion and medium build.
No suspect description is available for the second suspect.
The prime targets appear to be middle-aged to elderly women from the Asian community, but men have also been victimized, as well as families with children. One man was sent to the hospital after being hit with a handgun.
Anyone with information is asked to call Crimestoppers at (800) 222-TIPS.