(CNN) The United States is likely to "seriously consider" shooting down any North Korean missiles tests aimed at the waters around the US territory of Guam, but experts warn the technology isn't guaranteed to work. Pyongyang doubled down on its threats to launch missiles at Guam early on Thursday, announcing a potential plan on state media for the "simultaneous fire of four Hwasong-12 (rockets)." Adam Mount, senior fellow at the Center for American Progress, told CNN the US military could use its THAAD defense system or Aegis destroyers to stop any North Korean projectiles. THAAD, or the Terminal High Altitude Area Defense, is one of the US's main weapons against offensive missiles.Analysts say the US could test missile defenses if North Korea targeted GuamPyongyang's plan might be exactly that -- any failure would be a victory for Kim Jong Un
"The US might decide to put an Aegis system much closer to _ to have two levels of defense, but that's a presidential decision," he said.