The suspected mastermind behind the Paris attacks, which killed 129 people last week, was taken out in an early morning police raid Wednesday.

NBC News reports 27-year-old Belgian national Abdelhamid Abaaoud was killed in a siege on an apartment in the suburb of Saint-Denis, according to French prosecutors.

Abaaoud died along with a woman who detonated an explosive vest as police stormed the scene. Eight other people were also taken into custody, including the owner of the apartment.

The Washington Post reports the exact details of Abaaoud's death were not disclosed, though the Paris prosecutor's office said the militant's "impact-riddled body was discovered in the building."

In addition to the Paris attacks, Abaooud was also linked to at least four previous terror plots thwarted by French intelligence, including a plan to attack a high-speed train bound for the capital.

The extremist was originally thought to be at an ISIS stronghold in Syria, after fleeing anti-terrorist raids in Belgium. Investigators are trying to determine how Abaaoud was able to elude authorities and enter France undetected.

News of Abaaoud's death came as authorities conducted six raids in Brussels, one of which was at the home of a Paris suicide bomber, 20-year-old Bilal Hadfi. According to one source, the operation is still ongoing.

French Prime Minister Manuel Valls praised the work of French intelligence and police forces, but also talked about the possibility of future attacks.

"We know and bear in mind that there is also a risk of chemical or bacteriological weapons," Valls said to the French Parliament, warning that they "must not rule anything out."

His speech came during a debate on extending the country's state of emergency, put in place shortly after the terror attacks Friday. The measure was approved and is expected to be backed by the French Senate on Friday.

Though the possibility of ISIS militants sneaking in among Syrian refugees has raised fear among French citizens, French President Francois Hollande promised Wednesday to welcome 30,000 refugees over the next two years.

"We have to reinforce our borders while remaining true to our values," Hollande said.