The Punjab Government today sought 20 companies of paramilitary forces from the Centre besides deploying maximum force on the roads to avoid any untoward incident on the anniversary of Operation Bluestar amid fears of spillover of the Jammu violence to the state.The police also requisitioned a number of Reserve Battalions to maintain law and order. The additional force from the Centre was requested last in 2007 during clashes between Sikh groups and followers of Dera Sacha Sauda.