The Philippine Navy reported sightings of Chinese ships in the vicinity of Ayungin shoal as early as first week of May, the last stretch of the May 13 elections, and before the May 9 incident in Balintang Channel where the Philippine Coast Guard fired upon a Taiwanese fishing vessel and killed one of the fishermen.
The Department of Foreign Affairs filed a diplomatic protest on Chinese presence near Ayungin shoal May 10.
DFA Spokesman Raul Hernandez said in their protest, they cited “the provocative and illegal presence of the Chinese government ships around Ayungin Shoal.”