PARIS -- New video released by the Islamic State of Iraq and Syria (ISIS) on Sunday shows the extremists who carried out the Nov. 13 attacks in Paris committing atrocities in ISIS-controlled territory while plotting the slaughter in the French capital that left 130 people dead and hundreds injured. The group also threatened to attack Britain.

The 17-minute video shows the extent of the planning that went into the multiple attacks in Paris, which French authorities have said from the beginning was planned in Syria. The video was provided online by the SITE Intelligence Group, which monitors jihadi websites.

All nine militants seen in the video died in the Paris attacks or their aftermath. Seven of the attackers - four from Belgium and three from France - spoke fluent French. The two others - identified by their noms de guerre as Iraqis -- spoke in Arabic.

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Seven of the militants, including a 20-year-old who was the youngest of the group, were filmed standing behind bound captives, described as "apostates," who were either beheaded or shot.

"Soon on the Champs-Elysées," says Samy Amimour, who was raised in a Paris suburb near the French national stadium, as he holds a captive's head aloft.

The Nov. 13 attacks targeted a packed concert hall, a restaurant and cafe, and a soccer match at the national stadium.

French Foreign Ministry spokesman Romain Nadal said the government is studying the video but would not comment on its contents. France's Interior Ministry and the Paris prosecutor's office had no immediate comment.

The video was filmed before the men sneaked back into Europe and contains no footage shot by the attackers during the days of terror that began Nov. 13 and ended only on Nov. 18 with the death of Abdelhamid Abbaoud, who was believed to be the leader of the attacks.

Instead, it was assembled from material shot before the men left for Paris, news video and amateur video. The video did not specify where the nine men were filmed, but it was believed to have been in ISIS-controlled territory in Syria. Abbaoud is seen simply speaking in a room

One militant, Brahim Abdeslam, is seen at a makeshift shooting range. Abdeslam, whose brother Salah fled Paris that night and remains at large, blew himself up at a Paris cafe where he was the only victim. Salah Abdeslam is not seen in the video.

According to the anti-ISIS activist group Raqqa is Being Slaughtered Silently, Brahim Abdeslam and two other attackers were trained in Raqqa, the extremist group's stronghold and the capital of its self-proclaimed caliphate.

In the video, as in other ISIS propaganda trying to drive a wedge between European Muslims and their governments, the men say it is a religious duty to join them. They threaten more attacks in Europe, and the footage closes with one of the militants holding a severed head and footage of Cameron giving a speech - with a text in English warning that whoever stands with the unbelievers "will be a target for our swords."