Britain eases terror threat level after second arrest

British authorities rolled back the nation's terror threat level from critical to severe on Sunday, hours after a second man was arrested in connection with last week's subway blast in London.

Mark Rowley, assistant commissioner for London's Metropolitan Police, cited "rapid progress" of the investigation into Friday's apparent terrorist attack, but warned that another attack at some point remained "highly likely."

"There is still much more to do," Rowley said. "But this greater clarity and this progress has led (terrorism authorities) to come to the judgment that an attack is no longer imminent."

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