In connection with the acid attack case, the police on Saturday arrested a youth, Irfan, who reportedly accompanied the man who had thrown acid on the face of the 25-year old woman on Friday.Soon after the incident, on Friday, Sanjay Patil, the man who threw the acid, sustained seven stab injuries in the chest and abdomen, due to which he died. The police are still investigating whether the injuries were self-inflicted or he was attacked by somebody.