Britain decided in a 397-223 vote late Wednesday night to begin airstrikes on Syria. The first attacks were already made on Thursday morning on ISIS's oil fields.
A recent poll showed that Britons supported the decision to start strikes by a 48-31 margin. But many citizens criticized the decision. As the verdict was reached, opponents protested outside of Parliament.
London-based photographer Holly-Marie Cato was on hand as people demonstrated in her home city. Scroll down to see her photos.
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"There has been an outcry, not just from protesting crowds in Britain, but across social media," Cato, who is against the bombing, told Business Insider.
Crowds formed outside of the Houses of Parliament, and chants were yelled so loudly that they were apparently heard from within Parliament's walls.
Everything from "No more warfare! We want welfare!" to "Don't bomb Syria! No more wars!" were being chanted in unison by the crowd.
See the rest of the story at Business Insider