Rail and bus traffic was affected at several parts of Bihar today due to the bandh called by left parties against the Citizenship Amendment Act (CAA).<br />'' <br />'' Bandh supporters took to the road in Patna and different parts of the state holding banner, posters and raising slogans against the CAA.<br />'' <br />''<br />''They torched tyres and stopped vehicular movement on some national and state highways. <br />