Verse 2:234 talks about 4 months and 10 days of Iddah if a women's husband dies. She must not re-marry during this time.
And those who are taken in death among you and leave wives behind - they, [the wives, shall] wait four months and ten [days]
However I stumbled on a site that says, after conquering khayber and capturing prisoners of war, the prophet married Safiya without waiting for this Iddah. Safya husband was killed after they were captured.
What is the ruling of Iddah in this case. Was it a special privilege to Muhammad PBUH who can bypass it. Or the claim is simply wrong?