One man was killed and three others injured in an explosion in the Cairo suburb of Maadi, the Interior Ministry said in a statement.
The man who was killed, a building guard who was cleaning the property’s garden, found “an unidentified metallic object.” Upon handling, it exploded, resulting in his death and the injury of his wife and two children by shrapnel, the statement said.
The injured have been moved to hospital for treatment and the area was cordoned off and is being combed by security forces, it added.
There was no immediate claim of responsibility.
The government is taking on militants in the Sinai Peninsula, where militants loyal to Islamic State are based, and Islamist groups elsewhere in the country who generally target security forces.