A bomb has exploded at Cairo's High Court building, injuring nine, according to the health ministry.
Earlier reports said a person had died, but this has since been denied.
The area surrounding the building - which houses the General Prosecutor's office and is the headquarters of some of the country's most senior courts - is currently being searched by explosives experts.
After the explosion, hundreds of people in downtown's crowded Ramses Street, where the building is located, ran towards the explosion site, but security forces soon cordoned it off. The security cordon is, however, surrounded by hundreds of bystanders.
Cairo Governor Galal Saed visited the scene to examine the bombing's aftermath.
Tens of bystanders chanted in support of the police.
Egypt has recently seen a spike in bombings in civilian areas which seldom happened before as militants focused on targetting police and army personnel and facilities.
A car bomb in October detonated in the same location, causing 13 injuries but no deaths. Another bomb exploded in the nearby Qasr El-Nil Street in February but caused no injuries.
