I remember MSNBC reporting or trackingterrorism.com that the first hotel bombing included 2 explosions.
There were two additional explosions (as-Satan and Nuweiba) where there were fewer casualties (mostly Egyptian). I found those two initial Russian reports that were later dropped (didn't see the Palestinian one). So there may have been some initial confusion in the reports (the major hotel hit plus two smaller hits confused with two hits at the hotel). There were only three sites.
I found the statement interesting because a week later it reiterated the number "four" for emphasis (four explosions . . . four sites . . .four young Islamic men).
Maybe there is still one cell left?
There was speculation on Debka about that as it seems one of the cells was trying to kill government officials close to Gamal Mubarak.
If there were three hits, there is one that is left.