A blast that shook central Cairo on Friday morning took place near police headquarters, state television reported.
Reuters witnesses heard gunfire after the explosion. State television quoted witnesses as saying gunmen opened fire on buildings after the blast. Smoke was rising over the city centre.
Daily Telegraph journalist Magdy Samaan tweeted this picture:
Radio Sawa correspondent Zaid Benjamin shared this image:
More top news
A great-great-great-grandmother has become an unlikely star at the age of 93 after her grandson shared a video of her dancing to rap music.
Here's everything you need to know about the Libyan crisis and the announcement of a new national unity government.
Russia will pay the price for launching air strikes to prop up the Assad regime, the US defence secretary has warned.