Two David’s Sling interceptor missiles were fired at rockets launched from Syria on Monday morning, the first known operational use of the new state-of-the-art Israeli missile-defense system.

Syrian rockets that appeared to be heading towards northern Israel triggered alarm systems, sending residents in the Upper Galilee—and then just minutes later in the Golan Heights—scrambling for bomb shelters.

Ultimately, the Syrian rockets did not reach Israeli airspace and were found to be part of internal fighting that is still ongoing in southern Syria.

Israeli fighter jets were also reportedly rushed to the area, though the reports were unconfirmed by military officials.

Northern residents of the Jewish state reported seeing trails of smoke from the David’s Sling missiles and said they heard explosions.