Eyewitnesses said some of the victims were burned alive in the attack, in Mamudo town, Yobe state.

Dozens of schools have been burned in attacks by Islamists since 2010.

Yobe is one of three states where President Goodluck Jonathan declared a state of emergency in May, sending thousands of troops to the area.

A reporter from the Associated Press found chaotic scenes at the hospital in nearby Potiskum, where traumatised parents struggled to identify their children among the charred bodies and gunshot victims.

Survivors said suspected militants arrived with containers full of fuel and set fire to the school.

Some pupils were burned alive, others were shot as they tried to flee.

The BBC’s Will Ross, in Lagos, says this area has frequently been attacked by the Boko Haram militant group.

More than 600 people were believed to have been killed in 2012 by the group, which is fighting to overthrow the government and create an Islamic state in Nigeria’s predominantly Muslim north.

Pakistan (AP) — A suicide bomber targeting police killed at least 10 people in northwestern Pakistan on Monday, including the son and nephew of an Afghan official involved in peace negotiations with the Taliban, authorities said.

The bomber was riding a motorcycle and detonated his explosives as the police patrol drove by in Peshawar, said city police chief Liaqat Ali Khan.

The two Afghans who were killed, Qazi Mohammad Hilal Waqadand Mohammad Idrees, were working at their country’s consulate in Peshawar, said Afghan Consul General Syed Mohammad Ibrahim Khel in Peshawar.

However, it did not appear they were the target of the attack, Khel said.

Waqad’s father, Qazi Amin Waqad, is a member of the Afghan High Peace Council, said an official at the Afghan Embassy in Islamabad, Shakir Qarar. The council was appointed by the Afghan government to hold peace talks with the Taliban to end the 11-year-old war in neighboring Afghanistan. The peace council member was in Afghanistan when the attack occurred, and Waqad and Idrees were driving to work at the time, Qarar added.

The blast killed 10 people and wounded 42, said Khan, the Peshawar police chief. Three policemen were among the wounded. Many of the dead and wounded were on a nearby passenger bus, which bore the brunt of the explosion, said Khan.

Local TV footage showed the wreckage of the bus and the motorcycle, as rescue workers rushed wounded people to hospitals in the city.

No one immediately claimed responsibility.

The Pakistani Taliban has been waging a bloody insurgency against the government for years and has stepped up attacks ahead of next month’s parliamentary election.

Also Monday, two gunmen riding a motorcycle attacked a campaign office of an anti-Taliban political party in northwestern Pakistan, killing a worker there, police chief Khan said. The Awami National Party office is in the city of Nowshera.

Elsewhere in the northwest, a suicide bomber detonated his explosives near a vehicle carrying Awami National Party candidate, Mohammad Ahmed Khan, in Charsadda district, said local police chief Ghulam Hussain. Khan was not hurt, but one person was killed and nine were wounded, said Hussain.

On Sunday, the Taliban killed 11 people in bomb attacks on a political rally and two campaign offices in the northwest, part of their quest to disrupt the election. The group has killed at least 60 people in attacks on politicians and party workers since the beginning of April.

The Taliban have specifically targeted secular political parties that have supported military offensives against the militants in the northwest. The Taliban have largely spared Islamic parties and others who believe the government should strike a peace deal with the militants, rather than fight them.

There is a concern that the violence could benefit the parties that take a softer line toward the militants, because they are able to campaign more freely ahead of the May 11 election.

“Unless the government, the country’s independent election commission and security forces ensure that all parties can campaign freely without fear, the election may be severely compromised,” Ali Dayan Hasan, the head of Human Rights Watch in Pakistan, said in a statement issued Monday.

Bashir Jan, a senior member of the Awami National Party who survived a recent bomb attack in the southern city of Karachi, also criticized the government for not doing enough to protect candidates, but he said they were determined to carry on.

“These attacks will not deter us,” Jan said at a press conference in Karachi. “We are determined to contest elections.”

The Pakistani army on Monday finalized its plan to deploy troops to provide security during the upcoming election after discussions with civilian officials, the army said in a written statement that didn’t provide further details.