SECTION 25. Extra–Territorial Application of this Act. — Except as provided in the treaties and laws of preferential application, the provisions of this Act shall be enforced not only within the Philippine archipelago, including its atmosphere, its interior waters and maritime zone but also outside of its jurisdiction against those who should commit any offense covered by this Act while on a Philippine ship, airship, Philippine embassies and consulates, or other diplomatic premises.
link to the complete text of the Anti-Terrorism Act: Philippines-Anti-Terrorism Act-2005-eng