The bomb exploded in New Cairo, eastern suburb of Cairo, injuring two civilians and a policeman, security officials said.
The explosion took place only 200 meters from the vila of General Prosecuter's assistant Zakaria Abdel Aziz.
The bomb was targeted at Aziz and was described by officials as an assassination attempt.
The bomb disposal team immediately reached the site of the explosion to search for any more bombs.
The injured were transferred to hospital and were said to be in a critical condition.
The attacks began after the 2011 revolution that toppled former president Hosni Mubarak and increased after the removal of Islamist ex-president Mohamed Morsi.
Disclaimer: No Business Standard Journalist was involved in creation of this content