A 32-year-old man,apparently mentally unstable,was mauled and seriously injured by a tiger after he sneaked into its enclosure in the Tata Steel Zoological Society here,the police said on Sunday. The man Asif was found unconscious outside the cage of Raghav,a full grown tiger,early Sunday morning by the security personnel of the zoo. Sources said Asif seemed to have scaled the boundary wall,jumped into the open enclosure and when he opened the gates cage,the tiger attacked him and tried to pull him inside. However,the gate fell down during the attack leaving Asif outside. Asif who hails from Kapali,Seraikela-Kharswan district,near Jamshedpur was admitted to government-run M G M Hospital,sources said. We are trying to find out the intention behind his illegal entry into the enclosure, the police said. Asked whether the security arrangement would be tightened following the incident,Director Vipul Chakraborty said,We are reviewing all aspects regarding safety of animals.