The criminals fled leaving the victim in critical condition.
Police arrested three people early Saturday over gang rape of a worker in capital's Hazaribagh area.
The arrestees are Rony, 21, Nazir, 20, Shagor, 21.
During primary interrogation, Rony and Nazir confessed to police about their involvement. However, Shagor denied his involvement in the crime.
Additional Deputy Commissioner of Dhanmondi zone Abdullahil Kafi confirmed, Rony developed a love affair with the girl and took her to an under-construction building in Hazaribagh's Balurmath area around 6pm on Friday.
"Later, Rony along with his two friends raped her in turns," he said.
The criminals fled leaving the victim in critical condition, he added.
On information, police rescued the victim and sent her to Dhaka Medical College Hospital for medical test.
A case was filed against three people on Friday over incident.