More and more the rumor of a ship dumping dead sheep in the sea may have attracted the sharks - I think it was a combination of many things...here the article:

""We are getting marine biologists from abroad to assess the situation and why there was this change in biological nature," said Garana, referring to the repeated attacks, which one expert called unprecedented.

"This is unnatural. It has never happened before," he said. "We have no explanation."

Government conservation experts said on Friday they captured two sharks, an oceanic whitetip and a mako, which they believed had mauled two Russian women swimmers last Tuesday and Wednesday.

Government workers had dumped chum in the water to attract the sharks.
.......

South Sinai governor Mohammed Shosha has said the sharks could have turned frenzied after a ship transporting livestock dumped dead sheep into the sea, while marine experts said overfishing may have forced them closer to shore.

The string of attacks in Sharm el-Sheikh was "unprecedented," according to an shark expert Samuel Gruber, who heads Miami's Bimini Biological Field Station.

... "

[link to news.yahoo.com]