Officials said that the duo was under the influence of drugs when the car they were on almost hit a woman on Seventh Main Road at MGR colony in Shanthi Colony area around 5 pm. When the neighbours gathered to question the duo, they fled the spot. However, they returned around 7.30 pm and attacked the woman with a hand pump.
After she collapsed, they attacked her son who came to help her mother. Though they tried to escape from the spot, the neighbours who came to the rescue of the woman and son caught one of them. On information, the Anna Nagar police rushed to the spot and took custody of the man.
The victims filed a formal complaint, and the police are now searching for the other man, officials said.