18-year-old suspect arrested in connection with London tube bombing

LONDON, Sept. 16 (Xinhua) -- British police said Saturday they have arrested an 18-year-old man in Dover in southeast Britain in connection with the rush-hour tube bombing in London one day ago, which left at least 29 people injured.

The man was arrested on Saturday morning under the Terrorism Act and is held at a police station in Kent county in southeast Britain, the police said, as a nationwide manhunt is underway in the country after the bombing was declared a terrorist attack.

A Metropolitan police officer said the arrest was "significant."

British Prime Minister Theresa May on Friday raised the country's terror threat level to "critical," the highest that indicates a further attack may be imminent.