Bihar on Tuesday celebrated the 67th republic Day, with Governor Ram Nath Kovind hoisting the tricolour in the state capital city.The governor took salute at an impressive parade by security forces and, in a short speech, lauded the state government for development activities and combating corruption and crime.Kovind said rule of law prevailed in Bihar and motto of the Grand Alliance-led government was development of the state. Chief Minister Nitish Kumar hoisted the tricolour at his official residence here.