By Matthew Brooks

Security officials at a London airport suspected that a traveler was carrying something illegal.

According to Metro, the British police were contacted on a tip.

The tip said that there was a suitcase full of little blue bags that contained an unknown substance.

The police searched the suitcase in question. They found many of the little blue bags.

The search revealed that the unknown substance was a dairy-free cake mix.

The British authorities posted a picture of the suitcase’s contents on Twitter.

https://twitter.com/BTPSussex/status/1166730285167403008

The police asked that travelers label their food in their luggage.