Prohibitory order has been clamped and mobile internet services have been suspended in Manipur's Churachandpur district after an unruly mob vandalised and set on fire the venue where Chief Minister N Biren Singh is scheduled to attend a programme at New Lamka in the district on Friday. The District Magistrate of Churachandpur based on a report from the Superintendent of Police that there is likelihood of breach of peace, disturbance to public tranquillity and grave danger to human lives and public properties has clamped prohibitory order under Section 144 of CrPC in the tribal-dominated district.