That's the biggest single bomb we have now - the B83.
http://en.wikipedia..../B83_nuclear_bomb
Of course, multiple bombs could be used, but that seems, er, wasteful.
http://nuclearsecrecy.com/nukemap/ says 808k killed, 304k injured with a surface explosion in Jerusalem. Over 1 M dead for an air burst... :-(
Richie Daley probably knows some bulldozer contractors that could do the job without quite so many casualties... http://en.wikipedia....ition_and_closure
Cheers,
Scott.