I saw this on the history channel last night and couldn't believe it. The US and other countries have developed super lasers planted on torrits that through radar detect incoming mortars and missles, then a super laser heats them and in seconds they explode in the sky.
http://mae.pennnet.com/Articles/Article_Display.cfm?Section=Articles&Subsection=Display&ARTICLE_ID=213929

http://www.missilethreat.com/systems/thel_usa.html