The victims are elderly women who are at home alone at the time of the robbery.
The most recent robbery was on the 1200 block of Ashland Avenue on Friday morning. The elderly victim was awakened by the sound of the intruder in her house. The suspect rummaged through the house and stole personal items.
"The potential for this to get much worse is right there because this is a guy who prefers to go into places knowing there's someone home," said L.A. Councilman Jack Weiss.
One neighbor said the victim told her the suspect tied her up and terrorized her for hours while he robbed her house. Police have not confirmed this report.
"This is the safest seeming neighborhoods I've ever been in, so what happened on this block is something, I think, can happen anywhere," said neighbor Alice Hall. "It just was a surprise. I don't think a lot of people even know about it," she said.
One of the first victims was 84-year-old Earnestine Avilar of Culver City. She said the robber told her to obey him or else he would kill her.
The suspect's description is a black man wearing dark clothing and a dark mask.
"I'm a little freaked out. I'm married, and I have a very small dog. Now I wish I had a big shotgun," said neighbor Tracy Lonsdale.
Anyone with information is urged to call WeTip Hotline at (800) 78-CRIME, (800)782-7463.