A mentally unstable youth, who locked himself into a room in his house here Wednesday, continued to battle the policemen trying to get him out for over 24 hours.

The 27-year-old has been firing at the police with his father's licensed gun since Thursday morning.

Shamim alias Raju, son of a doctor in Bakshi-ka-Talab area on the outskirts of Lucknow, has been locked in a room since Wednesday night, police said. His father Shabeer Ahmad called the police Thursday morning when Raju refused to open the door and a few constables headed by an inspector were sent to get him out.