The arrestees were identified as Sirajul Islam, doctor of Shimul Clinic of the district town.
Mustafizur Rahman, officer-in-charge of Satkhira Sadar Police Station, said Sirajul used to harass the nurse after she joined the hospital around 15 days ago.
He gave the nurse a spiked drink at night on February 26. Later, Sirajul and hospital staff Mahamud took her to the roof and raped her.
Clinic owner Shaidul Islam and his son Mithun locked the victim inside a bathroom for two days and did not allow her to contact her family.
Police rescued the girl on Friday night after the victim’s family approached them. The nurse filed a case against the doctor, clinic owner and his son.
OC Rahman said they are trying to arrest other suspects.
Meanwhile, a youth was arrested for allegedly raping a minor girl in Sirajganj on Friday. He was identified as Jahidul Islam, a resident Sayedpur village in Chauhali upazila.
Masud Pervez, officer-in-charge of Enayetpur Police Station, said Jahidul lured the four-year-old girl with Tk 10 and took her to his house where he raped her on Feb 27.
Police arrested Jahidul after the victim’s mother filed a case against him on Friday evening.