"A knife-wielding assailant driving a sport utility vehicle mowed down panicked pedestrians and stabbed a police officer outside Parliament on Wednesday in a deadly assault..."

"... prompting the hasty evacuation of the prime minister and punctuating the threat of terrorism in Europe. At least five people, including the assailant, were killed and 40 others injured in the confusing swirl of violence, which the police said they assumed had been 'inspired by international terrorism.' It appeared to be the most serious such assault in London since the deadly subway bombings more than a decade ago.... For more than two hours, astonished lawmakers inside the House of Commons, some of whom had ducked for cover, were told to stay in place as officers searched the premises office by office."

The NYT reports.