AGARTALA, July 23: The ruling Left Front in Tripura has landed in a crisis following an assault on an RSP minister allegedly by CPI(M) activists. Both the CPI(M) and its alliance partners are locked in a rift over the incident which has jolted the state's political circles. The state's food minister and senior RSP leader Gopal Das was assaulted on Wednesday, the last day of the three-tier panchayat polls at a polling centre in South Tripura district.