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(FILES) In this handout file photo released by the Israel Defence Ministry on December 21, 2015, tests are being undertaken for Israel's David Sling's missile defence system, a medium-range interceptor, developed with United States backing, at an unknown location in Israel. Israel on Monday said its air defences fired at rockets that approached its territory from neighbouring Syria, where regime troops are advancing on opposition forces close to the Israeli-occupied Golan Heights. The statement said two of Israel's newly deployed David's Sling interceptors were launched "in response to the threat to Israeli territory," but added the Syrian rockets fell inside Syria. / AFP PHOTO / Israeli Army / -