Police detain protestors during a demonstration against the government's recruitment policy in Chennai. AFP

Thousands of young men attacked train coaches, burned tyres and clashed with officials at the station in one of India's poorest states.

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One dead in India unrest over military hiring; some gatherings banned

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At least 12 protesters were arrested and at least four policemen were injured, said Sanjay Singh, a senior police official in Bihar overseeing law and order.

"Around 2,000 to 2,500 people entered the Masaurhi railway station and attacked the forces," Singh told the media.

Railway employees douse a fire on a railway coach at Secunderabad railroad station in Hyderabad, India. AP

The Agnipath or "path of fire" system aims to bring more people into the military on four-year contracts to lower the average age of India's 1.38 million-strong armed forces and cut burgeoning pension costs, the government said.

Protesters, mainly young men, say the plan will limit opportunities for permanent jobs with the defence forces, which guarantee fixed salaries, pensions and other benefits.

Some retired military officials said the government's money-saving plan risks eroding the honour of serving the nation and the safety of India.

Reports of sporadic unrest in several parts of India prompted Prime Minister Narendra Modi's government to hold meetings to review the policy of hiring soldiers for shorter tenures.

The scheme calls for retaining 25% of the recruited soldiers after four years of service, with the rest getting priority for such jobs as with the state police.

Police detain protestors during a demonstration against the govt’s new recruitment scheme in Chennai. AFP

In Uttar Pradesh, India's most populous state, police arrested at least 250 people under what are called preventative arrests. Some demonstrators accused the police of using excessive force. One person was killed in protests this week.

Defence Minister Rajnath Singh met with the chiefs of the three armed forces at his residence in New Delhi as demonstrations continued, Reuters TV partner ANI reported.

Singh has appealed to young people to apply under the new scheme.

The navy chief said on Friday the protests were unexpected and probably the result of misinformation about the new system.

"I didn't anticipate any protests like this," Admiral R. Hari Kumar told ANI. "It is the single biggest human resource management transformation that has ever happened in the Indian military."

Reuters