Police raided an illegal abortion clinic and arrested three people in Bang Sue district on Thursday.
Police were acting on an anonymous tip that an abortion clinic was operating in Phahon Yothin area.
They raided the clinic after an assigned patrol police was refused entry to it, Pol Lt Amnart Harn-Chana, deputy chief of the Bang Sue police, said.
He said police had to pressure the clinic's staff to open its door after they refused to co-operate for more than 40 minutes.
Police found a seven-months pregnant woman, aged 21, at the clinic. She was sent to Ratchawithee hospital.
Three people were arrested, Suthiwan Hiranpruek, 52, Suphan Pronhommanee, 46, and Waan Phuprapan, 52.
The clinic has a legal medical licence issued by the Public Health Ministry five years ago. They began providing illegal abortion services about one year ago, the suspects admitted to the police.
The clinic provided services for women who were six to seven months pregnant, at the rate of 30,000 baht.
Police said the suspects all worked at the clinic but said the doctor, Veerat Hiranpruek, had no idea that they used his clinic for abortions.
The clinic has been closed for 30 days pending an investigation, police said.