Paris Terror Ringleader Abdelhamid Abaaoud Has Dead

The ringleader behind the Paris attacks is dead, killed during a dramatic raid that shook a neighborhood and collapsed an entire floor of an apartment building. But French authorities say their work is far from finished.

Six days after a coordinated string of shootings and bombings killed 129 people in the French capital, at least one suspect is still on the run. A series of raids in Belgium and a search of a home on the outskirts of Paris on Thursday were the latest signs of investigators' efforts to piece together -- and take down -- the network of terrorists behind the attacks before they can strike again.

And authorities say the threat from ISIS, which claimed responsibility for the attacks and threatened more worldwide, remains real.

"We just now have to be ready for anything, any kind of an attack. ... Although we know that the mastermind of the attacks of Paris has been killed, the risk is still very high," Paris Deputy Mayor Patrick Klugman told CNN's "Erin Burnett: OutFront" on Thursday.

French officials said the raid Wednesday at an apartment building in the northern Paris suburb of Saint-Denis was a significant step. On Thursday, they confirmed they'd identified the body of Abdelhamid Abaaoud, the ringleader of the Paris attacks, found in the rubble of the apartment.

Officials have also identified a woman who blew herself up during the raid: 26-year-old Hasna Ait Boulahcen, a relative of Abaaoud.

Investigators haven't revealed much about the suicide bomber. Friends of her family in their hometown of Aulnay-sous-Bois, on the northeastern outskirts of Paris, said she had lived there until recently. Residents in the area told CNN authorities had taken her mother and brother into custody. And the Paris prosecutor's office told CNN that police were searching the mother's home.

Interior Minister Bernard Cazeneuve said Abaaoud "played a decisive role" in the Paris attacks and played a part in four of six terror attacks foiled since spring, with one alleged jihadist claiming Abaaoud had trained him personally.

Wednesday wasn't the first time authorities had tried to take Abaaoud down. Western intelligence agencies reportedly tried to target Abaaoud in the months prior to the Paris attacks, without success.

A key question now: Are other top ISIS operatives who may have worked with Abaaoud on the Paris plot still on the loose?