An international rights group says Egyptian security authorities are using enforced disappearce as a tool to stifle dissent.

In a new report released on Wednesday, Amnesty International says there has been an "unprecedented spike" in enforced disappearances since early 2015 in Egypt.

The report documents 17 cases it says reveal "the shocking and ruthless tactics" of the Egyptian authorities to crack down on government opponents.

Philip Luther, Director of the Middle East and North Africa Programme at Amnesty International said that "the report exposes not only the brutality faced by those disappeared but also the collusion between national security forces and judicial authorities, who have been prepared to lie to cover their tracks or failed to investigate torture allegations, making them complicit in serious human rights violations."