Dozens of human rights organisations from around the world have signed an open letter to the Egyptian authorities calling for a full investigation into the death of a young filmmaker in a maximum security prison.

Shady Habash was 24 when he died earlier this month, and had already been detained without trial for more than two years.

He was acccused of spreading fake news and belonging to an illegal organisation over a music video that made fun of President Abdel Fattah el-Sisi.

Officials say Habash died after drinking hand sanitiser by mistake but the letter’s authors question this account.

They urge Egypt to release all artists and writers in pre-trial detention which they say violates international treaties Egypt has signed.