Philippine security officials present alleged Chinese spies, following the arrest of another Chinese citizen detained for espionage this month. The arrests come as confrontations between the two Asian neighbours over contested reefs and waters in the strategic South China Sea have escalated in recent months. National Bureau of Investigation (NBI) director Jaime Santiago tells a press conference that the men used a drone to document goings-on at a naval detachment, coast guard ships, an air base, a naval base and a dockyard in Palawan province. IMAGES AND SOUNDBITES