Punjab Police have registered an FIR in connection with an alleged security lapse at Congress leader Navjot Singh Sidhu's Patiala residence, officials said on Monday.

On Sunday, Sidhu said a suspicious person, with a grey blanket wrapped around his body, was spotted on the terrace of his residence. He said the person escaped after a servant raised the alarm.

A police official in Patiala said a case had been registered and an investigation is under way.

CCTV footage of the area is being scanned, he added.