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Heartbreaking drawings by the child victims of a Boko Haram massacre have given a glimpse into the horrors inflicted by the extremist group as yet another attack kills at least 24.

The crude crayon illustrations show militants firing automatic weapons and burning buildings to the ground - a poignant depiction of the atrocities witnessed by the young victims.

The children are encouraged to draw the emotive pictures depicting their accounts of the slaughter as part of UNICEF-led therapy sessions in the country of Chad.

(Image: Getty)

They have been published at the same time as the Islam extremists committed yet another deadly attack on innocent civilians in neighbouring Nigeria.

In the latest killings, a group of Boko Haram soldiers disguised as preachers drove cars to a mosque in the remote village of Kwajafa, in Borno state.

They announced they had arrived to teach Islam but, once a crowd had gathered around them, they opened fire indiscriminately with handguns and assault rifles before setting fire to nearby houses.

At least 24 people are understood to have been killed in the shootings.

'People didn't know the Boko Haram men came for attack because they lied to our people that they came for preaching,' said Buba in a telephone conversation.

'They opened fire on them and killed many people,' he said, adding that houses were set on fire.

(Image: Getty)

Some people were being treated for gunshot wounds and burns at a hospital in the Borno state town of Biu on Monday, a source there said.

Boko Haram has taken part in a six-year insurgency in Nigeria as it fights to impose an Islamic state.

The jihadi's campaign and President Goodluck's failure to end it were reported to be key factors in the victory of opposition candidate Muhammadu Buhari in last week's elections.

Boko Haram's six-year insurgency in Nigeria, and President Goodluck Jonathan's failure to end it were key factors in the victory of opposition candidate Muhammadu Buhari in last week's election.

Thousands of people, including hundreds of young girls, have been kidnapped and killed by the militant organisation since the start of their deadly rampage.

Resistance in the form of military operations by Nigeria and neighbours Chad, Cameroon and Niger has seen much of Boko Haram's territory taken back in the past two months.

(Image: Getty)

The militants have been condemned worldwide over accusations they are forcing young kidnap victims to marry their captors and using children as shields and human bombs.

UN human rights chief Zeid Raad al-Hussein said last week the group was taking young girls as wives and using children as 'expendable cannon fodder'.

He told the UN Human Rights Council in Geneva that the groups actions would constitute war crimes and crimes against humanity if they are confirmed.

His speech came in response to recent reports that hundreds of women and children were seized from Nigerian primary schools to be used as 'human shields'.

The Islamists took as many as 500 adults and children from primary schools in the north-eastern town of Damasak in late February, Mike Omeri, spokesman for the fight against Boko Haram, said.