Unidentified assailants on Sunday set off three improvised bombs near the home of an Egyptian judge who had sentenced Islamists to death and to long jail terms, Ahram Arabic news website said.
The explosions outside the apartment of judge Moataz Khafagi, who presided over the trial of Islamists during the past year and a half, damaged the building's facade and smashed the windows of three cars, a prosecutor said.
The judge, who was at his apartment in the southern Cairo suburb of Helwan, was not injured in the after-dawn blasts which wounded four people.
Khafagi was the judge in several cases which involved Islamists against the backdrop of a state crackdown following the ouster of Islamist president Mohamed Morsi in July 2013. In June 2014, he sentenced a dozen Islamists to death over the killing of a police general during an assault in the town of Kerdasa, a stronghold of Morsi supporters.
He also sentenced the top leader of Egypt's outlawed Muslim Brotherhood to life in jail along with 14 others on charges of murder and inciting violence during clashes near Cairo in 2013.
One of the suspects in Sunday's attack was arrested while two others escaped, a security source said.
Bombings and shootings by militants have become commonplace since Morsi's removal following mass protests against his one-year rule and a crackdown on his supporters. Over the past 21 months hundreds have been killed as a result of attacks which have mainly targeted security forces, though civilians have also frequently been caught in the violence.
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