Prime Minister Manmohan Singh could not travel by bus due to security reasons.
Defence Minister A.K. Antony, Finance Minister P. Chidambaram, Communications and IT Minister Kapil Sibal, Health Minister Ghulam Nabi Azad and Road Transport and Highways Minister C.P. Joshi were amongst those in the bus.
Around 35 senior party who are members of the all powerful Congress Working Committee members travelled to the venue in another Volvo bus, the sources said.