Egypt’s public prosecutor, Hisham Barakat, was seriously injured when a car bomb struck his convoy as it was leaving his home in Heliopolis in Cairo on Monday, in a high-profile attack against the judiciary, security and judicial sources said.

Two civilians and two policemen were also wounded in the attack. Zakariya Abdel Aziz, an assistant public prosecutor, said it was an assassination attempt.

Judges and other officials have increasingly been targeted by Islamist militants opposed to President Abdel Fattah al-Sisi and apparently angered by hefty prison sentences imposed on members of the now-outlawed Muslim Brotherhood.

A little-known group calling itself the “Giza Popular Resistance” claimed responsibility on its Facebook page for the

attack, according to Reuters.

“The situation is not reassuring,” said judge Ali Yousef, who spoke to Reuters from al-Nozha hospital, where Barakat was being treated. “Doctors tell us his condition is not stable.”

Health ministry spokesman Hossam Abdel Ghaffar said Barakat had undergone surgery after he had dislocated his shoulder and suffered from a deep cut, with the suspicion of a fractured nose.

Abdel Ghaffar said Barakat was in stable condition and was currently in the recovery room.

Witnesses said the explosion was strong enough to shatter glass in nearby store-fronts and homes. A large plume of black smoke and several smoldering cars were seen near apartment buildings.

Barakat’s place of work was also targeted earlier this year when a bomb exploded near the High Court in central Cairo, killing two people.

Egypt is facing a Sinai-based insurgency that has killed hundreds of policemen and soldiers since the army toppled Islamist President Mohamed Mursi after mass protests against his rule in 2013.

The most active group is Sinai Province, which has pledged allegiance to Islamic State, the group that has taken control of large parts of Iraq and Syria.

A video titled “Eliminating the Judges” was published by the group’s media arm on Sunday, which showed gunmen opening fire on a vehicle they said was carrying judges.

Three judges were shot dead in the northern Sinai city of al-Arish in May.

As the country’s top prosecutor, Barakat is responsible for overseeing the investigation of incidents, charging people, and referring cases to the appropriate courts.