VIDEO London Has Fallen trailer - Gerard Butler can't save Big Ben

There's a sequel to Olympus Has Fallen on the way. It's called London Has Fallen...

Let's take a minute to think about that title shall we? Last time it was a codename for the US President and he was in pretty serious trouble at the White House. Gerard Butler saved him, all was well with the world again. This time, the POTUS is in London for a state funeral when things get explody so Butler is going to... rescue the entire city?

Here's the teaser. It doesn't really tell us a lot.