A fire has caused serious damage to the headquarters of imprisoned Egyptian opposition leader Ayman Nour.
The fire caused extensive smoke damage to the building
No-one was injured in the blaze in his offices in the capital, Cairo.
The police have said an electrical fault may have been the cause but Mr Nour's wife suggested that there was evidence of arson.
Mr Nour, a former member of parliament, last month lost his appeal against a five-year prison term for forging political documents.
The United States has described the conviction as a miscarriage of justice.
Mr Nour came a distant second to the incumbent Hosni Mubarak in the 2005 presidential election.