The Russian jetliner that disintegrated over the Sinai Peninsula in Egypt last weekend killing 224 people did so because a bomb, planted by ISIS itself or one of their affiliates, blew up on board — according to United States intelligence via reports by both CNN and NBC News.

The plane, Metrojet Flight 9268, was bound for St. Petersburg, Russia on Saturday when it suddenly exploded and fell from the sky just 23 minutes after taking off.

More from CNN:

The assessment was reached, the official said, by looking back at intelligence reports that had been gathered before Saturday’s plane crash and intelligence gathered since then. The United States did not have credible or verified intelligence of a specific threat prior to the crash, however, the official said, prior to the incident, “there had been additional activity in Sinai that had caught our attention.”

Officials did emphasize that while the verdict isn’t completely conclusive, there is a ““definite feeling it was an explosive device planted in luggage or somewhere on the plane.”

The Associated Press also corroborated this report, and added this:

Stay tuned to the blog for further information on this still-developing story.

To see the video that ISIS claims is the jet exploding in the sky, click here.

Gawker