Washington: The US Senate on Friday rushed through a $225 million (Dh826 million) Bill to replenish Israel’s missile defence system, and House of Representatives approval was expected in the final hours before lawmakers began a summer break.

The money will go to restocking Israel’s Iron Dome, which has been credited with shooting down dozens of incoming rockets fired by Palestinian fighters over three and a half weeks of war in Gaza. The vote came two days after the Pentagon announced ammunition deliveries to the Israeli regime and as a planned 72-hour ceasefire between Israel and Hamas unravelled almost as quickly as it began.

Efforts in the Senate to approve the money stalled on Thursday night after Republican Sen Tom Coburn sought cuts elsewhere in the budget to pay for the aid.

Earlier, senators attempted to lump the Israel money into a broader spending Bill that included border security and wildfire assistance money. That Bill failed to get the necessary 60 votes on Thursday, and the House had little interest in it, anyway. Friday’s separate Israel Bill passed by voice vote.

Shortly after the Gaza conflict erupted, President Barack Obama praised the missile defence systems as proof of America’s commitment to Israeli security. His administration sent the Israeli request to Congress for more Iron Dome money even as the president and Secretary of State John Kerry have been seeking a humanitarian cease-fire.

The Iron Dome system has emerged as a game-changer in the current round of violence, with Israeli officials citing a success rate as high as 90 per cent.

The system uses radar, advanced tracking technology and anti-missile batteries to follow the trajectory of an incoming rocket or mortar and determine if it is headed for a major population centre. If an urban area is threatened, interceptors are fired to detonate in the air in close proximity to the missile. Projectiles not posing a threat are allowed to fall in empty fields. The system targets short-range rockets with a range between 3 and 72 kilometres and interceptors cost as much $100,000 apiece.

Created by Israel’s Rafael Advanced Defence Systems, Iron Dome has enjoyed strong US technological and financial support.

Throughout its history, the US has provided more than $700 million to help Israel cover costs for batteries, interceptors, production costs and maintenance, the Congressional Research Service said. The total already appeared set to climb above $1 billion after Senate appropriators doubled the Obama administration’s request for Iron Dome funding for fiscal 2015. Now it seems likely to rise even further, with Obama expected to sign any bill swiftly into law.

It’s unclear, however, how quickly the new supplies might reach the battlefield. And Israel and Hamas may be in for a prolonged fight.