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Pupils in Uganda were singing gospel songs before a deadly attack by Islamist militants on Friday, a woman who lives opposite the school says.

"Then I heard screaming," Mary Masika told the BBC. The vicious attack in Mpondwe left about 40 people dead.

Islamic State-linked militants have been blamed for the attack.

The Allied Democratic Forces (ADF) was created in the 1990s and took up arms against President Yoweri Museveni, alleging persecution of Muslims.

They are now largely based in neighbouring Democratic Republic of Congo.

The Mpondwe Lhubiriha Secondary School attacked on Friday is close to the border.

Ms Masika says she and other residents have been left terrified by the attack which lasted about 90 minutes.

"I have been unable to eat or sleep since then," she told the BBC in Swahili.

The students usually sing before bedtime - and at first she and her daughter thought the noise that interrupted their songs at around 22:00 (20:00 GMT) suggested that they were having a bit of fun.

But it soon became clear that something horrific was underway at the school, which had around 60 boarders living in a small compound.

ADF rebels had entered dormitories, setting fire to them and using machetes to kill and maim students.