A truck hit pedestrians on Westminster Bridge before crashing into a railing, and a police officer was fatally stabbed near the House of Commons.
Police in bright fluorescent jackets shepherded tourists, journalists and lawmakers away from Parliament after Wednesday's brazen attack.
Rep. Devin Nunes, House Intel Committee chair, said the conversations of Trump team members may've been captured "incidentally." An explainer.
Security experts have warned that such terror attacks are a growing threat in Europe and the U.S. and by their nature very difficult to prevent.
Witnesses share their firsthand accounts of what happened during the attack in London on Wednesday.