Some US intelligence analysts and Middle East security officials believe that a rocket shipment seized by the Israeli Navy in the Red Sea this month was destined for the Egyptian Sinai and not for the Gaza Strip, as Israel says.
Israel has little compunction about drawing scrutiny to the rocket arsenals of Gaza's governing Hamas Islamists and other armed Palestinian factions, with whom it has regularly clashed.
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Israel says the Syrian-made M302 rockets and other munitions were hidden aboard the Panamanian-flagged Klos C while it docked in Iran. The ship was intercepted on March 5, en route to Sudan - where, Israel says, the arms would have been offloaded and trucked to Gaza through Egypt, a standard trafficking route.
Israel's allegation, echoed by its Western allies, was dismissed by Iran and Hamas as a fabrication. Officials in Egypt declined comment, saying they knew nothing about the rockets.
Israel has been hazy in public about how the 5.5 meter-long (18-foot) M302s might have entered Gaza. The coastal enclave is under heavy Israeli surveillance, and Cairo has clamped down on the Egypt-Gaza frontier and the smuggling tunnels there.
Asked on the day of the ship seizure which Palestinian militants were to have received the arms cache and how, Defense Minister Moshe Ya'alon said: "I don't know, but it is clear this was meant to reach terrorist groups in the Gaza Strip ... The route is well known and it seems that they tried to revive it."
Rockets hard to smuggleAn Israeli military officer who took part in planning the naval interdiction told Reuters that, in the month before it happened, "not once did I hear anyone mention anything other than Gaza as the end-point for these weapons".
A US official said Washington had confirmed the Syrian and Iranian provenance of the rockets and believed they were to have been used against Israel. But half of US intelligence analysts thought Sinai, not Gaza, was the destination, the official said.
"You look at those things and it's obvious they couldn't have been slipped into Gaza," the official said, adding that the M302s were not designed to be disassembled for easier smuggling.
Israel said it had also found 181 122mm mortar shells aboard the Klos C, and some 400,000 7.62-calibre bullets.
The US official agreed that the mortar shells were meant to go to Gaza, saying: "You can fit each of those in a backpack." But the bullets, the US official said, may have been meant for another client elsewhere in Africa.
With their 160 km (100 mile) range, the M302s could have been launched from areas of Sinai well away from Israeli spotters along the Egyptian border, and struck Tel Aviv or Jerusalem.
A regional security source said Israel would have kept Egypt informed about the seizure but that both countries would have kept the contacts discreet. Many Egyptians dislike their 1979 peace accord with Israel and would resent being reminded of Israeli cooperation in efforts to rein in militancy in the Sinai.
Egyptian military officers, visiting Israel two weeks ago as part of routine security meetings, were taken to Eilat to view the Klos C in dock, a source briefed on the visit said.