In the wake of twin blasts in Hyderabad, the security has been stepped up in temples and oil refineries here. "As soon as we got the information about blasts in Hyderabad last evening, the security was immediately tightened around the temples of Mathura and Vrindavan and refineries situated on Agra-Delhi highway," SSP Pradeep Yadav said. All the security forces have been alerted to deal with any unfortunate situation, he said.