Two persons were killed and 17 others injured as a blast rocked the heart of Guwahati on Monday even as death toll of Sunday's group clash in eastern Assam's Tinsukia district mounted to seven.

Senior superintendent of police, Guwahati city, informed that a bomb planted by suspected United Liberation Front of Asom militants rocked Anthgaon area in the heart Guwahati at around 12.30 pm on Monday.

The bomb was suspected to be planted in a motorcycle in front of Marwari Maternity Hospital near the crowded market at the main crossing market in the area. Two motor-cycles, parked in the cycle-rickshaw and hand-pulled cart stand, were badly damaged.

The SSP claimed that one of the bomb carriers might have died in the blast. Utter chaos prevailed in the area immediately after the blast, just before senior police officials reached the spot.

The injured were rushed to Guwahati Medical College hospital as the police and Central Reserve Police Force cordoned off the area where tattered clothes and shoes of victims lay strewn all over.

Meanwhile, the death toll due to Sunday's group clash between armed tea garden workers and ULFA-backed protestors, who were blocking the National Highway 37 in protest against the 'fake encounter' killing of one Budheswar Moran by the army, mounted to seven with the recovery of two more bodies from the violence-hit areas.

The violence claimed five on Sunday, forcing the district administration to impose curfew in areas under Doom Dooma, Dholla and Kakopathar police stations.

The indefinite curfew was extended to many other areas, including the refinery township of Digboi and Makum on Monday as simmering tension gripped the area.

There were reports of sporadic incidents of violence from different parts of the violence-hit areas. The police fired upon a mob of tea workers at Hanhchora under Doom Dooma police station on Monday morning injuring three.

Meanwhile, chairman of the banned ULFA Arabinda Rajkhowa, in an e-mailed statement, accused the Indian Army of conspiring to engineer clashes between tea workers and protestors after failing to neutralise the popular agitation against the 'fake encounter' killing of Budheswar Moran.

In a separate incident, one person was killed and 40 others injured when a bus carrying protestors met with an accident at Kakopathar area on Monday.