Crowds are beginning to gather in Tahrir Square to protest against President Mursi's new powers. State television showed a number of protests outside mosques across the city.
Supporters of the president have been staging counter protests, but there are no reports of clashes.
More top news
Teenage schoolchildren who use e-cigarettes dramatically increase their chances of graduating to tobacco, research has shown.
A year after the launch of a landmark plan to tackle the crisis, leading figures say a "much more robust" strategy is needed.
A van ploughing into pedestrians in a busy area of Barcelona echoes the circumstances of atrocities that have hit several countries.