Second Man, 21, Arrested in Connection With London Tube Attack

Police Arrest 18-Year-Old in Connection with London Tube Terror Attack

American Celebrating 1st Wedding Anniversary Among 14 Dead in Spanish Terror Attacks

At Least 13 Dead, 50 Others Injured as Van Plows Into Crowd of People in Barcelona, Spain

1 Dead, Several Injured After Car Plows Into Pedestrians at White Nationalist Rally: 'I Am Heartbroken'

Several Reported Shot as Gunman Opens Fire at Hospital in New York

Officer Stabbed in the Neck at Michigan Airport by Man Shouting 'We're All Going to Die': Cops

At Least 1 Pedestrian Dead In 'Vindictive' Van Attack Outside London Mosque

Trump Slams London Mayor After Terror Attack And Shuns 'Political Correctness'

7 Killed After Van Slams into Pedestrians on London Bridge and Men Attack People With Knives