IMPHAL, Aug 7: All Manipur Students’ Union (AMSU) has appealed to the authorities concerned to resolve the present crisis of Sadar Hills and ensure that the blockade on the national highways is lifted in the interests of the people of the state. A release of the AMSU stated that the national highways have been used by some organizations as a tool to fulfill some of their vested interests. The central as well as state government should set up highway protection force to ensure that no disturbance is given to the transportation of essential commodities, it added.