The Delhi Police has arrested three persons for selling fake oxygen cylinders to needy people. The accused painted fire extinguishers as oxygen cylinders. “During inquiry, it was found that distributor Ravi Sharma was removing red paint of fire cylinders which were used for filling of CO2 and was converting them into oxygen cylinders by painting them black with the help of Abdul and Shah,” Deputy Commissioner of Police (Shahdara) R Sathiyasundaram said.