In the scuffle, a Personal Security Officer accompanying Yadav's sons -- Tarun and Tejpal -- lost his service pistol, for which a complaint has been filed in the local police station.

Police sources said a preliminary probe revealed that Yadav's sons had allegedly indulged in eve-teasing first at Ashoka hotel and later at Connaught Place.

From there, the two, accompanied by the PSOs of Delhi Police and Railway Protection Force, decided to attend a party at Chhatarpur area on Delhi-Haryana border.

On their return, they allegedly passed some remarks at girls who were partying at a farm house near Mehrauli.

However, this time they ran short on luck when a group of youngsters decided to thrash them. The PSOs, sensing the gravity of the situation, did not reveal the identity of the two, the sources said.

Nursing bruises, Tarun and Tajpal were rushed to a hospital where they were provided first-aid, the sources said, adding at that stage the PSO realised that his service pistol had gone missing in the scuffle.