MANILA - Peter Joemel Advincula, the man who claimed to be "Bikoy" in a series of anti-Duterte videos, was taken to the Philippine National Police General Hospital Friday, after he complained of chest pains a day after he surrendered to authorities.

As of 11:28 a.m., Advincula was still under observation in the medical facility.

Advincula, who claimed to be the hooded man in the web series that tagged President Rodrigo Duterte's family to the narcotics trade, surrendered to police Thursday due to alleged threats against his life and his family.

He recanted his earlier pronouncements that Duterte's son, incoming Davao Rep. Paolo Duterte and senator-elect Bong Go received payoffs from drug syndicates.

He tagged Sen. Antonio Trillanes, the Magdalo group and the Liberal Party as the masterminds behind the web videos' production.

All parties and individuals allegedly behind the "Ang Totoong narcolist" series denied Advicula's claims and challenged him to back his statements with evidence.

Several senators cast doubt on Advicula's credibility, saying the man had been issuing flipflopping statements since 2016, when he linked former President Benigno Aquino III to the illegal drug trade.

Advincula was expected to post bail for his estafa case later this afternoon.

- report from Raffy Santos, ABS-CBN News