Hyderabad,Dec 16: Stepping up their agitation, the Joint Action Committee (JAC) of Coastal and Rayalaseema regions favouring the united Andhra Pradesh stir,called for a bandh of all State and Central Government offices for Thursday.According to sources,the JAC members have threatened to intensify their integrated Andhra Pradesh agitation by spearheading protests and dharnas in all district headquarters in the Coastal and Rayalaseema regions.Charting out a plan of action, the JAC has decided to form human chains to block road traffic in the districts on Dec 18 followed by rasta-rokos on Dec 19,on the Bandar Road in Vijayawada.The agitators have also planned mass fasts in support of their demand.