
Philippine military chief General Gregorio Catapang released what he said were satellite photos of intense recent Chinese construction over seven reefs and shoals in the Spratly archipelago of the flashpoint South China Sea.
"We have compelling reasons to raise our voice to tell the whole world the adverse effects of China's aggressiveness," Catapang told reporters, describing the reclamation and construction activities as "massive".
Catapang said this was causing concern "not only because it would deter freedom of navigation, but also due to its possibility of military purposes".
China claims sovereignty over most of the resource-rich and strategically important sea, including areas close to other Asian nations, using vague demarcation lines that first appeared on Chinese maps in the 1940s.
The Philippines, Vietnam, Malaysia, Brunei and Taiwan have overlapping claims.