It may have been a bottle infection, which would mean that it might only affect the one bottle.
but you don't wanna risk it. Get those puppies chilled down. It'll stop (or at least slow) fermentation if that's what's going on, plus it'll allow the CO2 to absorb into solution and reduce the pressure some.
What was your FG?
edit: Damn... too late. Another senseless death of homebrew. *sigh*