Stopping them is difficult, since many give little advance indication they are planning attacks.
Witnesses described the chaos that erupted outside the church during a Friday Mass.
Islamic State claims responsibility for London blast.
Girl: “I feel like maybe some people are dying for attention and they want to be on TV or something.”
Police are treating explosion as a possible suicide bombing.
President Trump: “So sad to hear of the terrorist attack in Egypt. U.S. strongly condemns.”
President Trump: “The city of London and her majesty’s government have the full support of the U.S. government in responding to the attack and bringing those to justice who are responsible.”
Attackers in New Year’s Eve celebration were dressed as Santa Claus.
“We have to strike a balance between privacy and protection.”
Army commandos rescued at least 13 people after the standoff at trendy restaurant.
“Different people should be accepted. It’s 2016.”