The military says it intentionally crashed the unmanned aircraft last night because of a malfunction.
The military would not say how many aircraft were grounded. The planes will stay down during an investigation.
An Israeli defence official said the drone was the Israeli-made Heron 1, which flies at high altitudes and can stay in the air for about 45 hours. The official spoke on condition of anonymity because he was not authorised to brief reporters.
Last year, a larger Heron TP drone crashed on a routine flight.