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Indian officials reacted with outrage Sunday to an audacious attack by about 200 suspected Maoist rebels who killed 24 people by setting off a bomb and firing on a convoy carrying ruling party leaders and members in an insurgency-wracked state.

Saturday's ambush, which targeted Congress party politicians returning from a campaign event with the area's indigenous tribal community, appeared to be a warning to officials to stay away from the rebels' main base of support.

Prime Minister Manmohan Singh and party President Sonia Gandhi visited some of the 37 people who were injured in the attack in a hospital Sunday in the Chhattisgarh state capital and said the government would take firm action against the perpetrators.

"We are devastated," said Gandhi, who denounced what she called a "dastardly attack" on the country's democratic values.

Rajnath Singh, president of the opposition Hindu nationalist Bharatiya Janata Party, said the country should unite in its fight against the Maoist insurgency.

The convoy was attacked in a densely forested area about 345 kilometers (215 miles) south of Raipur, Chhattisgarh's capital, as the Congress members were returning from a party rally.

Four state party leaders and eight police officers were among the 24 people who were killed. Other victims were party supporters.

Police officer R.K. Vij said 11 of the 37 injured were in serious condition.

Police identified one of those dead as Mahendra Karma, a Congress party leader in Chhattisgarh who founded a local militia, the Salwa Judum, to combat the Maoist rebels. The anti-rebel militia had to be reined in after it was accused of atrocities against tribals -- indigenous people at the bottom of India's rigid social ladder.

The dead also included state Congress party chief Nand Kumar Patel and his son. The injured included

The Press Trust of India news agency said the attackers blocked the road by felling trees, forcing the convoy to halt. Vij said the suspected rebels triggered a land mine that blew up one of the cars. The attackers then fired at the Congress party leaders and their supporters before fleeing.

Congress is the main opposition party in the state. It has stepped up political activities, trying to win the support of tribals, ahead of state elections scheduled to be held by December.

K.P.S. Gill, a former police chief of Punjab state who has written widely on reform, said the attack was "a very horrifying incident."

However, Gill said the state government was incapable of devising a strategy to tackle the Maoist threat. "They don't have the political will and bureaucratic and police set-up to prevent such attacks," he said.

He said the state government had ignored the need for special forces to tackle the threat. "Most of the special forces in the state are being used for non-operational duties like guarding state politicians," he said.

Prime Minister Singh has called the rebels India's biggest internal security threat. They are now present in 20 of India's 28 states and have thousands of fighters, according to the Home Ministry.

The rebels, known as Naxalites, have been fighting the central government for more than four decades, demanding land and jobs for tenant farmers and the poor. They take their name from the West Bengal village of Naxalbari where the movement began in 1967.

The fighters were inspired by Chinese Communist revolutionary leader Mao Zedong and have drawn support from displaced tribal populations opposed to corporate exploitation and official corruption.

The government has offered to begin peace talks with the rebels, but without success. The Maoists demand that it first withdraw thousands of paramilitary soldiers deployed to fight the rebels.

Maoist rebels carried out two major attacks in Chhattisgarh in 2010. They ambushed a paramilitary patrol in April that year, killing 76 troops in their worst attack ever. A month later, they triggered a land mine under a bus carrying civilians and police, killing 31 people.