one of the busiest ports in the united states is shutdown and all due to a tilting tower. brianna keilar is here with more on that and other top stories. briann in? >> well, wolf, the beauty port of houston is expected to stay closed until tomorrow at least, because a high voltage steel tower is leaning to one side after a tow vessel rammed it sunday. and workers are called there to remove big john to remove the tower. they hoped to connect it today, but the powerlines are going slower than expected and in the meantime, dozens of ships have nowhere to go. and militants have attacked another convoy carrying supplies for troops in afghanistan. gunmen fired on the convoy in western pakistan killing one person, and this is the fourth attack since friday. the pakistani taliban claimed responsibility for two of the attacks saying they are in