Israel is worried about "security" in Sinai

"As law enforcement returns elsewhere in Egypt six months after the ouster of President Hosni Mubarak, there is still almost no sign of the police in Bedouin-dominated North Sinai, the region along the border with Israel that has long been a center of criminal activity. Mr. Mubarak treated it as virtual enemy territory and flooded it with police officers as he sought to help enforce an Israeli blockade of Gaza.  And now the withdrawal of his security forces has unleashed not only a smuggling bonanza but also a more violent backlash against his Israel policy. Six unexplained bombing attacks (the first one failed to go off) have repeatedly shut down a pipeline that delivers natural gas to Israel under a Mubarak-era contract that is wildly unpopular because of its association with both Israel and corruption. The interruption of the gas supply has done as much as any formal policy change to strain relations between the two allies. No one has been arrested in any of the attacks.  The Egyptian military announced over the weekend that it was deploying more troops to the border region to help with security, but Bedouin around Rafah said Monday that they had noticed no change."