Tripura's ruling CPI-M on Wednesday formed a human chain involving around 250,000 people with a slew of demands for the central government.The Communist Party of India-Marxist said the human chain covered 323 km and covered virtually all parts of the state."Our leaders, party members and supporters from all age groups organised the first ever historic human chain all across Tripura," CPI-M state secretary Bijan Dhar said."Braving heavy rains, men, women and youths, including labourers and party functionaries, took part in the human chain."Besides Dhar, ministers Badal Choudhury and Gautam Das and senior leaders Narayn Kar and Tapas Datta took part in the hour-long human chain. The six demands raised on the occasion include withdrawal of the land acquisition bill, higher budgetary allocation to rural development schemes, supply of 35 kg a rice to each poor family for Rs.2 per kg and special economic package to the northeastern states.