could there be anything better than a book by dr. suess? get ready, kids, for the dr. suess museum. "nightly news" begins now. >>> good evening. today the details of that deadly attack that terrified london last night began to come into sharper focus as survivors told their stories. police have made arrests and say they're still searching for associates of the attackers, but they do believe they shot and killed all of the suspects directly involved last night. dozens were injured. and among those killed not only british citizens, but a french national and a canadian. today strong words from britain's prime minister theresa may. >> there is, to be frank, far too much tolerance of extremism in our country. enough is enough. >> president trump used twitter to weigh in on how best to combat terrorism. our team has been reporting on this all day, and we begin tonight with our chief foreign correspondent richard engel. richard, good evening. >> reporter: good evening, kate. isis has just claimed responsibility for this attack, but it offered no proof that it was directly involved. this wa