To avoid being governed by Hamas.

Palestinians run as they try to cross to the Israel side at the Erez Crossing, in the northern Gaza Strip, Saturday, June 16, 2007. Dozens of Palestinians converged on the Erez crossing with Israel on Saturday, trying to leave the Gaza Strip following Hamas’ takeover.

Also, Arafat’s Nobel Peace Prize appears to have been liberated by Hamas:

Enraged Fatah leaders on Saturday accused Hamas militiamen of looting the home of former Palestinian Authority chairman Yasser Arafat in Gaza City.
“They stole almost everything inside the house, including Arafat’s Nobel Peace Prize medal,” said Ramallah-based Fatah spokesman Ahmed Abdel Rahman. “Hamas militiamen and gangsters blew up the main entrance to the house before storming it. They stole many of Arafat’s documents and files, gifts he had received from world leaders and even his military outfits.”