The authorities in the northern Nigerian state of Kano have imposed a ban on Muslim men and women travelling together on public transport. They say the ban is in accordance with Sharia law. Men and women-only buses and motorcycle taxis were paraded in a mass rally at a stadium in the city of Kano. Kano is one of several Muslim majority states that adopted Sharia law in 2000, a move which led to inter-religious riots that left thousands dead. Under the ban, commercial motorcylists seen carrying women could be fined. Correspondents say the scheme has been quite well-received by all communities as Christians will still be able to use existing non-segregated vehicles. The governor of Kano state said a new force of 9,000 uniformed police would enforce the law. Kano is one of 12 northern states which have implemented Sharia law since 2000. The move initially heightened tensions between Muslims and Christians and led to clashes which left thousands dead. Human rights groups have condemned abuses sanctioned under the law including amputations and flogging, and say it discriminates against women. Sharia law appears to have retained popular support in the north. But there is significant opposition to the law, especially among the Christian minority.