the all-new nissan versa sedan from $10,990. innovation upsized. innovation for all. next on msnbc saturday, on alert. the september 11th terror threat. new information on the search for the plotters and the possibility that two may be americans. plus, ten years later. americans remember september 11th. a look at how the day changed america and the world forever. under water. parts of the northeast still reeling this morning from some of the worst flooding there ever. welcome to msnbc saturday. i m alex witt. it s just past 9:00 a.m. in the eastern. 6:00 a.m. out west. let s get to what s happening as we get new information this morning about the men who may be involved in a possible al qaeda bomb mroet against new york and washington. officials say two of the three men may be u.s. citizens. the men started their journey in pakistan. they may have flown to the u.s.