LONDON — A British official was suspended from the Foreign Office after he grabbed a Greenpeace U.K. protester by the neck and forcibly ejected her from a black-tie dinner in London’s financial district, the prime minister’s office said on Friday.

Video of the encounter on Thursday night showed the official, Mark Field, a Conservative member of Parliament, jumping from his seat, grabbing the protester and shoving her against a post. She and fellow climate activists, all dressed in red gowns with sashes declaring a “Climate Emergency,” had flooded the room where the chancellor of the Exchequer, Philip Hammond, was delivering his annual address on the state of the economy.

The footage drew outrage, and Greenpeace U.K. accused Mr. Field of assault, with one of the activists taking part, Hannah Martin, telling BBC Radio on Friday “What he did, as anybody can see from the video, was completely disproportionate and unacceptable, particularly for a sitting member of Parliament.”

She later posted on Twitter: “There’s nothing like a female led peaceful protest to bring out the true character of an entitled man.”