The bus, which was on way to Lahore in Pakistan from New Delhi, has been taken to the Haryana Roadways workshop in Ambala City where it was being attended to, officials said.
A strong posse of policemen has been deployed around the bus of the Pakistan Tourism Development Corporation and the workshop.
No passenger has been allowed to disembark, they said.
The Delhi-Lahore bus, also known as Sada-e-Sarhad, was officially launched on March 16, 1999.
