Nearly 90 percent of Palestinian rockets engaged by Israel's Iron Dome interceptor have been shot down during the surge of Gaza fighting this week, up from 85 percent in the previous mini-war of 2012, say Israeli and U.S. officials.
Seven batteries of the system, made by the state-owned Rafael Advanced Defense Systems Ltd and partly funded by Washington, have been rotated around Israel to tackle unprecedented long-range salvoes by Hamas guerrillas, according to Reuters.
Rafael said it had been working on improvements to Iron Dome, which is designed to fire guided missiles at rockets that threaten to hit populated areas while ignoring others.
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"We've been constantly fine-turning the programming of the system, including during the fighting. Our engineers are on the ground, with the military crews, analysing each interception and making adjustments to get the best results," said a Rafael spokesman.
There have been few injuries and no fatalities from rockets that hit towns or cities – results that also reflect Israel's extensive investment in air raid sirens and shelters.
Israeli leaders say that by stemming rocket damage, Iron Dome dampens domestic pressure to escalate the current aerial barrage against Gaza into a more devastating ground invasion.
"Iron Dome has had impressive achievements so far – a strategic influence on how the campaign is being waged," Defence Minister Moshe Yaalon said in a statement.
But he also cautioned: "Complacency is forbidden."
An Israeli air force officer said that the system had "approximately 90 percent" success since violence escalated sharply on Tuesday.
A U.S. official who monitors the system's performance said of the Israeli finding: "We believe that to be very close."
Israel said that of more than 320 rockets launched from the Gaza Strip, at least 72 were intercepted while most of the rest fell harmlessly in open areas.
At least 71 Palestinians, mostly civilians, have been killed in Israeli military strikes since Tuesday, Gaza officials said.
Iron Dome was initially billed as providing city-sized coverage against Katyusha-style rockets with ranges of between 3 miles 42 miles.
Addressing a Tel Aviv conference hosted by Israel Defense magazine on Monday, Avi Serfaty, deputy general manager of Iron Dome radar manufacturer Elta, said the system could now provide defence at distances of up to 95 miles, potentially allowing more versatile use of batteries deployed nationwide.
Elta is a subsidiary of state-owned Israel Aerospace Industries.
Since Tuesday, Hamas and other Gaza guerrillas have launched rockets as far as 73 miles, threatening Israel's commercial hub Tel Aviv, northern Haifa port, the holy city of Jerusalem and a nuclear reactor in the southern town of Dimona.
Some of the long-range rockets have been Syrian- and Iranian-supplied M302s with 317-pound warheads, Israeli experts say, while others are locally made M-75 rockets with much smaller explosive payloads.
Given the 10 percent of failed interceptions, Israeli officials have warned against so-called "Iron Dome tourism", where the public, reassured by the system's performance, stay outdoors to watch the shoot-downs rather than taking cover.
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