Mumbai, Feb 12 (ANI): Mumbai police on Wednesday detained Maharashtra Navnirman Sena chief Raj Thackeray near Chembur where he and his convoy was stopped en route to Vashi for flagging off the anti-toll agitation. He along with his workers was out on streets protesting against the collection of tax at toll plazas in the state. Earlier, Mumbai Police has warned MNS workers and Thackeray that action will be taken against them if they indulge in vandalism or disrupt law and order during their agitation against toll collection. Thackeray, who has announced a state-wide "rasta roko" on February 12 to press for the abolition of toll tax, has dared the government to arrest him.