Still early yet, but it looks like it got loose from the tug and drifted into the bridge. Demasted and some injuries apparently.
In one cell phone video I just saw, it looked like there was a tug running full speed on the Mex. ships starboard side, trying to get caught up and "behind" it to possibly get it stopped but the Mex. ship just was moving too fast and after it went under the bridge and sheared off the masts it crashed into a seawall, dock or pier. It certainly looked like the ship was just moving backwards with the current.No power? Must be a heck of a current. In the video I saw she was going astern at quite a lick.