A petition condemning the arrest, detention and torture of peaceful activists in Egypt has been signed by dozens of international academics, trade unionists and political and rights activists.
The 'Defend democratic rights in Egypt' petition was initiated by the US-based Egypt Solidarity Campaign, which supports the 2011 uprising against Hosni Mubarak.
Signatories include including prominent writers Noam Chomsky and Naomi Klein.
The letter was addressed to interim President Adly Mansour and Prime Minister Hazem Beblawi.
Allegations of arbitrary arrests and torture of activists have been on the rise in Egypt in recent months.
The authorities have repeatedly denied torture takes place in the country.
Most of those detained, including hundreds of Islamists, are accused of breaking a new protest law which requires an official permit in advance of any demonstration or public conference.
Those detained include independent leftist activist Alaa Abdel-Fattah, April 6 Youth Movement founders Ahmed Maher and Mohamed Maher, and Egyptian Popular Current member Ahmed Douma.