is carrying a bucket onto the subway. we want to see if we got funger pri -- fingerprints on that bucket. are there parts of the device, some electronic parts, that have indicators that allow you to know where it was bought or produced. then the second order, which involves the data explosion. as soon as you identify somebody, that's facebook, phone, e-mail, travel. the investigation will explode after that one. >> as you know, gloria, the president was quick to respond to the attack on twitter. he said, another attack in london by a loser terrorist. these are sick and demented people who were in the sights of scotland yard, must be proactive. that tweet was not received very kindly by the british prime minister theresa may. this is what she said in response. >> i never think it's helpful for anybody to speculate on an