Eight civilians killed in Egypt's Sinai
One of the officials said the attacker was an employee who had been fired from the restaurant in the Agouza area in the centre of the Egyptian capital.
Security officials earlier said 18 people died.
Militants have claimed a number of bombing and shooting attacks in Egypt, mostly against members of the security forces since the army toppled President Mohamed Mursi of the Muslim Brotherhood in 2013 after mass protests.
At least 3 Egypt police killed in Sinai bombing: state TV
Earlier, Masked gunmen on a motorcycle shot dead four Egyptian policemen south of Cairo on Saturday, the interior ministry said.
The gunmen opened fire on a police vehicle, killing those inside, in an area between the famed Giza pyramids west of Cairo and the Saqarra pyramids to the south, the ministry said in a statement.
The attackers’ affiliation was not immediately clear.
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