China's judicial and relevant authorities handle the case involving three Filipinos suspected of engaging in spy activities in China in strict accordance with the law, Foreign Ministry spokesman Guo Jiakun said on Thursday.

The three Filipinos living in China have been detained by China's national security authorities for suspicion of espionage, according to reports.

The authorities will also guarantee the lawful interests of the people involved in the case, Guo said at a regular news conference.

"Recently, the Philippines have fabricated several cases of 'Chinese spies', made presumptions of guilt without any clear facts, and tried to vilify and politicize the cases," Guo said. "China is firmly opposed to this, and has lodged stern representations several times."

Guo urged the Philippines to stop making groundless accusations, handle the cases involving Chinese citizens in a lawful and just manner, and take effective measures to guarantee the lawful rights of Chinese citizens in the Philippines.