French President Francois Hollande said the man "was looking to kill or at the very least create a dramatic incident."
The threat to the U.S. is not immediate, said one U.S. official, but the threat to South Korea is "grave and current."
House GOP leaders are now talking about dropping "essential health benefits" from their health care bill. What are these benefits, anyway?
Police identified the suspect as Khalid Masood, 52, on Thursday. The British-born suspect was known by a number of aliases, police said. He was shot dead by police after plowing a vehicle into pedestrians on the Westminster Bridge, before crashing it into a railing outside the House of Commons. He later fatally stabbed a cop.
They were among 92 students from a French private school who were on a week-long visit to London.