Shoppers were among those injured in the blasts

A string of blasts, many in busy markets across Assam state, have killed 11 people and injured more than 30.

Police have blamed the attacks on a separatist group, the National Democratic Front of Bodoland (NDFB).

This weekend saw the 18th anniversary of its fight for an independent homeland for Bodo people in Assam.

Markets targeted

The BBC's Subir Bhaumik in Calcutta says the NDFB rebels set off one explosion in a fish market in Gouripur and another in Bijni, both in western Assam.

Three people died in Bijni and a further three in Gouripur.

The blasts left 31 people injured, mostly shopkeepers and buyers.

Earlier in the day, five people had died in a chain of explosions targeting village markets, an electricity grid and a gas pipeline in Assam.

Two of those killed were NDFB rebels who died when a bomb in their bag exploded.

Lynching

Church congregations in Assam and the neighbouring state of Nagaland are holding services in memory of those killed in Saturday's violence.

NATIONAL DEMOCRATIC FRONT OF BODOLAND Separatist group of the Bodo tribe, who accuse authorities of plundering the region's natural resources and flooding it with outsiders. One of around 30 groups fighting for greater autonomy or independence in north-east India Suffered major losses in military operations by Indian and Bhutan forces this year Bloodshed coincides with 18th anniversary of founding

More than 100 people were injured, some of them seriously, during the attacks.

Blasts also rocked village markets at Gosaigaon and Dhekiagula in western Assam early on Sunday, injuring at least six people.

And Sunday also saw Muslims lynch a Bodo tribesman and beat up several others in Makri Jhora, the scene of a gun attack on Saturday in which 11 people died.

A further nine people were killed on Saturday in gun and bomb attacks in western Assam.

Most of those who died were Bengali-speaking Muslims.

Additional police and paramilitary troops have been rushed to Makri Jhora and surrounding areas, where Muslims are in a majority.

Death toll rises

Meanwhile, the death toll in the twin bomb explosions in the town of Dimapur in Nagaland has risen to 36 after eight victims died of their wounds overnight.

India's violent north-east

Two Naga rebel factions, both maintaining a ceasefire with Indian security forces, have blamed each other for the blasts.

However, intelligence officials say they suspect that the NDFB is also behind the Dimapur attack, as well as a late night assault on a passenger train on the Assam-Nagaland border.

Analysts say the NDFB, which suffered major losses during a Bhutanese military offensive in December, is trying to recover its influence in the region.

Indian Home Minister Shivraj Patil has flown to Dimapur to take stock of the situation, ands is also due to meet Assam's Chief Minister, Tarun Gogoi.