MANILA, Philippines ? A doctor who is under fire for allegedly videotaping his sexual escapades has returned to the country, National Bureau of Investigation (NBI) Director Nestor Mantaring said.

Doctor Hayden Kho arrived in the country from Japan last May 16, Mantaring told reporters.

?We monitored that [Kho] arrived in the country from Japan last May 16,? the NBI chief said.

On Thursday, the NBI subpoenaed Kho and two other doctors, Vicki Belo and Eric Johnston Chua in connection with its investigation on a sex tape featuring Kho and actress Katrina Halili.