Heated arguments broke out between Railway Minister Lalu Prasad Yadav's son and securitymen outside Chief Minister Nitish Kumar's official residence after the former's car was stopped on a restricted route on Monday, police said.

The incident occurred when Tej Pratap, elder son of Lalu Prasad and Leader of Opposition Rabri Devi, was returning home at 10, Circular Road, from school by a car which was stopped by the security personnel.

The Circular Road is closed for normal traffic every Monday when Nitish Kumar holds his durbar at 1, Anne Marg.

After his car was halted at a wooden barricade, Pratap informed of the same at his residence and a number of people from there including Rabri Devi rushed to the place following which the dropgate was lifted and the vehicle allowed to proceed to its destination.

However, soon Tej Pratap along with others arrived at the entrance of the Janata Durbar, where they began shouting slogans against the chief minister.

A miscreant in the crowd also tore a portion of a tent erected to shelter the policemen in order to pull it down, police said.

Additional Director General of Police (HQ) Abhayanand told reporters that some homeguards were dragged into the Lalu-Rabri residence and manhandled.

Rabri Devi, however, denied any misbehaviour by his son and those accompanying him, with the securitymen posted at the chief minister's Janata Durbar.