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A man suspected of killing two French police officers in a Paris suburb on Monday night had pledged allegiance to the leader of the so-called Islamic State and threatened to kill non-believers, the Paris prosecutor has said.
Francois Molins also said that searches of Larossi Abballa's home had uncovered a list of targets including "rappers, journalists, police officers and public personalities".
Three men are currently being held in connection with the investigation.
Two people close to a man who killed two French police officers in a Paris suburb on Monday night have been held for questioning, a police source has said.
The source added that the attacker had been put under wiretaps recently without any results.
The man who killed two police officers in a knife attack at their home in a Paris suburb filmed a video during the attack, French officials have told the Associated Press.
A man pledging allegiance to so-called Islamic State stabbed a French police commander to death outside his home on Monday night before killing his partner, who was also an officer.
A man suspected of killing two French police officers at their home in a suburb of Paris had a past terrorism conviction for recruiting jihadist fighters in Pakistan, officials said.
Larossi Abbala, 25, from the Paris suburb of Mantes-la-Jolie, was convicted in 2013 to three years in prison, including six months suspended for association with a terrorist enterprise.
Abbala is suspected of stabbing a policeman outside his house in Magnanville on Monday night, before killing his partner. He was killed in a police raid on the house.
French President Francois Hollande is holding an emergency meeting with senior officials after a man pledging allegiance to so-called Islamic State stabbed a policeman to death outside his home near Paris, before killing his partner.
The killing has been described as a "terrorist attack" by the French government.
Prime Minister Manuel Valls, Interior Minister Bernard Cazeneuve and Justice Minister Jean-Jacques Urvoas gathered in the presidential office on Tuesday morning.
Mr Cazeneuve is to visit the two suburban police stations where the two officers worked following the meeting.
The killing of a policeman and his partner near Paris on Monday night was a "terrorist attack", a French government spokesman has said.
Islamic State's Amaq news agency said one of the group's fighters was responsible for the killing.
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Another woman's body has also been found after the end of the hostage situation in a Paris suburb.