(KUNA) -- At least six people, including two Indian paramilitary personnel, were seriously injured Thursday evening in a bomb explosion at a market in India's Northeastern state of Assam. Guerrillas suspected to be from the outlawed United Liberation Front of Asom (ULFA) triggered an improvised explosive device at the main market in the oil township of Digboi in Assam, Thursday, news agency Indo-Asian News Service reported.Four citizens and two soldiers of the Indian Central Reserve Police Force were wounded in the blast. The market was totally crowded with people when the explosion took place, the news agency said. The injured have been shifted to a local hospital. This is the latest attack by the ULFA that forced the Indian government to suspend a six-week old ceasefire against the rebel group and resume military operations against it last weekend. The key demand of ULFA is sovereignty for Assam which the Indian government is unwilling to negotiate.