How do you accidentally fire an anti-missle missle?

DUBAI (Reuters) - A Patriot missile hit a farm in Qatar after being accidentally fired from a base used by U.S. forces in the Gulf Arab state, Al Jazeera television said on Tuesday.
The Qatar-based television said the missile launched from Assayliyah base did not cause any casualties. The Patriot system is an anti-missile system.
Officials at Assayliyah were not available for comment.
U.S.-allied Qatar was a launch pad for the U.S.-led invasion of Iraq in 2003. It hosts the U.S. Army's Central Command (CENTCOM).

www.reuters.com/article/newsO...17718320071016 (external - login to view)

www.albawaba.com/en/countries/Qatar/217639 (external - login to view)