alert. critical. the first time since they reached that stage since the aftermath of the 7-7 attacks in 2005. thousands of armed troops are patrolling landmarks in london and beyond. as officials say they fear another attack may be imminent. not to be overshadowed by this, we re learning more about the 22 people that died in monday s horrific attack. we told you yesterday about 8-year-old saffie, the youngest. more on the investigation later in this hour. first to rick leventhal live in manchester. rick? shepard, we learned from u.s. defense officials saying that the bomber, salman abedi, spent three weeks in libya before traveling to london. a few days before monday s attack. manchester police are focused on tracking down anyone that had any connection whatsoever to abedi.