Days after the assembly polls concluded in the northeastern state of Tripura, Left parties launched a scathing attack on the ruling Bharatiya Janata Party (BJP), accusing it of ransacking and burning down houses of workers of the opposition parties and demolishing their party offices. The Opposition on Thursday formed an eight-member delegation, comprising leaders of the CPI(M), the CPI and the Congress, who will be going to Tripura on a fact-finding mission after a series of incidents of violence emerged, a member of the Communist Party of India said.