PARIS—A new video released by the Islamic State group purports to show the extremists who carried out the Nov. 13 attacks in Paris committing atrocities in IS-controlled territory while plotting the slaughter in the French capital that left 130 people dead and hundreds wounded. The group also threatens Britain.

The 17-minute video, released Sunday, shows the extent of the planning that went into the multiple attacks in Paris, which French authorities have said from the beginning were planned in Syria. It also is likely meant to serve as a recruitment tool to rally followers to the extremists’ sinister cause.

All nine men 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.