San Francisco police are searching for a man suspected of targeting elderly residents and robbing them.
Police said the man has struck at least four times in the last month, with all robberies reported in the Chinatown area.
"Everybody is scared," said Lisa Kang, referring to residents in her building on Grant Avenue. Kang said the suspect has hit her building more than once, which has put people on edge.
On Tuesday, police said the robber followed an 88-year-old woman to her door, covered her mouth and then took her cash.
The suspect also is known to trick people into getting his way inside their homes.
"Our guy went in and spoke Chinese and said he was there to spray for roaches," San Francisco Police Capt. Garret Tom said. "He spoke Chinese but wasn't Asian."
Tom said the man stole the victims money and punched her in the stomach when she tried to stop him.
The suspect is described as a 40- to 50-year-old man, well dressed and was last seen wearing a red tie. Police are reaching out to senior centers to urge residents not to open the door for anyone they do not know.