The Iron Dome system intercepted seven rockets fired at Ashkelon and the Hof Ashkelon Regional Council, the IDF said Wednesday. Three foreign workers were injured in an ongoing rocket and mortar attack on southern Israel. Two of them sustained serious wounds and one sustained light wounds. Related stories: 2 badly hurt in ongoing rocket attack on south Residents: Obama uses Sderot as campaign tool '7 countries want to buy Iron Dome' Israel's anti-missile system starred in the third and final presidential debate between President Barack Obama and Mitt Romney on Monday. Responding to allegations that he failed to visit Israel as president, Obama said, "When I went to Israel as a candidate I didn’t take donors, I didn't attend fundraisers, I went to Yad Vashem, the Holocaust museum there to remind myself of the nature of evil and why our bond with Israel will be unbreakable. "And then I went to the border town of Sderot, which had experienced missiles raining down from Hamas and I saw families there who showed me where missiles had come down near their children's bedrooms…which is why as president we funded an Iron Dome program to stop those missiles." Though Obama's opponents often accuse him of failing to stand by Israel's side, his administration has invested hundreds of millions of dollars in Israel's anti-missile system. Last year, Obama approved a $205 million aid package for the development of anti-missile batteries. In May, it was reported that following Israel's request, Washington decided to allocate $1 billion for the Iron Dome and Magic Wand systems. This is in addition to the annual defense aid provided to Israel which stands at more than $3.1 billion a year. Follow Ynetnews on Facebook and Twitter Receive Ynetnews updates directly to your desktop