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.
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There are reports that at least some MPs and Lords have been left unable to access their emails as a result of the attack.
Cuillin, six, and four-year-old Lejla designed the memorial plaque to their mum that has been installed in the Commons chamber.
Over-abstraction and an exceptionally dry winter are affecting hundreds of streams in England and Wales, warn wildlife experts.