An alleged Pakistani spy has been arrested from the Indira Gandhi International airport in New Delhi by security agencies.

"One Pakistani spy was arrested at IGI airport yesterday," Union Home Secretary G K Pillai said without giving out any further details.

Official sources said that security agencies have seized some documents and photographs from him.

They said his interrogation is on and the investigators are trying to find out his contacts and the places visited by him.

Teams have apparently been sent to western and central UP.