Isn’t snapchat end-to-end encrypted?

Hi!

I just bumped into [this article](https://www.bbc.com/news/world-europe-68056421.amp) describing how someone’s snapchat message got flagged by Spanish authorities because of a plane-bomb hoax/joke.

It is explained that the message got “picked up by Gatwick’s wifi” before being reported to the authorities.

Does anybody know how this is possible? Isn’t a snapchat conversation supposed to be end-to-end encrypted?

Thanks!

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