terror attacks
Extra security is being added across New York City and to Washington D.C.'s subways after explosions killed at least 34 people.
Gunmen led a deadly assault on a beach at a resort town.
Tim Cook said that the government was asking for "the software equivalent of cancer."
Here's where the group stands in the country.
WHAT'S HAPPENING
"When the World Trade Center came down, I saw something that no place on Earth could have handled more beautifully."
"I know what it's like to have my father killed on national television."
Matthew said mass killing at the Bataclan was "1,000 times worse."
"What happened in Paris could happen here."
"I would hate to do it, but it's something you're going to have to strongly consider."