SHILLONG, SEPT 4: Accusing police of biased action, the Khasi Students' Union (KSU) on Friday set a three-day deadline for the government to arrest those behind the attack on anti-public hearing protesters at Lum Syrman. After its CEC meeting on September 4, KSU said the state government during talks on August 26 had assured action on five key demands. These include setting up facilitation centres…