Yeah the bridges could be the spliting in 3 but there's a few other things that we should look at.
We know that they talk in code so the spliting in 3 could be code for them to take out 3 different cities.
Also given that most of us here believe that the blackout we had earlier this year. (as well as the blackouts in the UK, Australia, and other countries that have supported us), they could be planing to take out the entire power grid of the US. (
http://www.ctv.ca/generic/WebSpecials/powergrid/image1.html',)
It could be a number of things so be ready for anything folks and pray that this is just a hoax to try and scare us or our guys are on top of this and can stop it.