Hindon Air Base is located about 30 km from Delhi.
A man was arrested in Ghaziabad after he allegedly intruded into the high-security Hindon Air Base, police said on Friday.
Last night around 2 am, the person was noticed by security personnel while he was trying to trespass into the premises of the critical Indian Air Force installation, they said.
Sonu, a resident of Loni area in Ghaziabad, was caught by a personnel, but he thrashed the personnel before disappearing into the dense jungle inside the air base, police said.
An alarm was then raised and the local police was informed and after combing operation the trespasser was arrested, police said.
Two days ago Delhi Police had arrested three Jaish-e-Mohammed terror suspects who were planning Pathankot-style terror attacks in malls in the national capital region or NCR and at the Hindon airbase, about 30 km from the national capital.
Senior officials of defence and civil staff reached the IAF base and took stock of the security situation.
Senior Superintendent of Police Dharmendra Singh told reporters the intruder "seems to be mentally retarded".
Defence security agencies handed him over to Sahibabad Police this evening after detailed interrogation.