China's embassy in the Philippines has issued a safety alert for Chinese enterprises and nationals in the country ahead of a planned protest against China.

The notice said "a massive anti-China demonstration" is about to happen, within days, as tension between the two countries escalated following disputes over Huangyan Island in the South China Sea.

Chinese nationals are advised to be on alert, enhance safety awareness, and avoid going out, according to the notice issued by the embassy's Economic and Commercial Section.

It also urges Chinese nationals to stay away from protesters, keep a low profile, and abide by local laws.