He added that the person escaped after a servant raised an alarm.
The Punjab Police has registered an FIR in connection with an alleged security lapse at Congress leader Navjot Singh Sidhu's Patiala residence, officials said today.
On Sunday, Navjot Sidhu said a suspicious person, with a grey blanket wrapped around his body, was spotted on the terrace of his residence.
He added that the person escaped after a servant raised an alarm.
A police official in Patiala said a case has been registered in the matter and an investigation is underway.
CCTV footage of the area is being scanned, he added.
Taking to Twitter on Sunday, Navjot Sidhu said he had spoken to the Punjab Police chief and the SSP of Patiala over the issue.
"This security lapse will not deter me from raising my voice for Punjab," he tweeted.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)