The Delhi police on Friday booked cases against the three youngsters who on Thursday night breached the prime minister's security at his official residence.

Delhi Police Commissioner K K Paul said the three were booked for impersonation and trespassing, both of which are bailable offences.

The police have sent word to the parents who are expected to bail the three out.

The three were earlier identified as Yogita and Veena Chaudhary, both residents of Jaipur and stewardesses with Air Sahara and Imran of Delhi. Soon after the incident, Air Sahara said it will sack the two girls.

"We have decided to terminate their services. They were anyway grounded since June 1 for various complaints against them," Alok Sharma, of Air Sahara told rediff.com.

While breath-analyser tests of the three done at Ram Manohar Lohia hospital has shown they were not drunk, the police has sent the blood samples to the All India Institute of Medical Sciences for further analysis.

The Prime Minister's Office had stated that there was no security breach as people can come up to the reception area of the complex and are turned away if they have no appointment.

"There was no security breach. All those who have genuine appointments are allowed inside the reception and others are turned away," the Prime Minister's Media Advisor Sanjaya Baru had said.