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Violent protests have broken out across Nigeria against the government's decision to end fuel subsidies, amid the ongoing state of emergency declared last week.

Protesters formed human barriers along motorways, hijacked buses and set up bonfires in Lagos, the country's commercial capital, as police set upon the demonstrators with tear gas and batons.

One of the country's main unions claimed police shot dead a protester, but police denied it, saying he was killed by a mob.

The end to the subsidy will mean a fuel price hike of more than double in a country where most people live on less than £2 per day.

Meanwhile, gunmen have attacked a police station in northern Nigeria's Jigawa state, killing a teenage girl and wounding an officer.

Burning tyres

Burning tyres in Lagos

It was not immediately clear who was behind the attack, though Islamist group Boko Haram has been blamed for many similar incidents in northern Nigeria.

"The gunmen shot indiscriminately into the police station and engaged our men in a shootout, killing a teenage girl trying to flee and wounding a policeman," state police commissioner Hashimu Argungu said.

"They threw an explosive into the police station but it did not detonate, which saved the police station from being destroyed, although its walls were riddled with bullets from the attack."

President Goodluck Jonathan declared a state of emergency in parts of four states hard hit by attacks blamed on Boko Haram on December 31.

In one of the most bloody attacks, a Christmas Day bombing at a church killed 30 people and left many more injured in the capital Abuja.

While he met with his cabinet as violence continued around the country, unions are also expected to meet to decide on a national day of industrial action.