Egyptian authorities seized six U.S.-made missiles in the Sinai Peninsula Friday that security officials said were likely smuggled from Libya and bound for the Gaza Strip.

Libya's 2011 uprising and subsequent civil war left the country awash in weapons, including rocket-propelled grenades, automatic rifles and other munitions. Since the end of the country's eight-month conflict, smugglers have transferred some of the weapons to Islamic militants in Egypt's Sinai Peninsula, which has faced a security vacuum since the country's own uprising, and from there onward in underground tunnels to neighboring Gaza.