In the first incident, a 19-year-old girl complained that her colleague Rohit called her to Parvatiya Colony on Monday, from where he took her to a secluded place in Nangla village and raped her, police said.
Police have registered a case against Rohit and are investigating further.
In another incident, a 22-year-old woman from Zakopur village was raped yesterday by two persons.
The incident took place when she was working in a field, police said, adding, Asif and Tohid, forcibly put her inside their car and took her to Kabulpur village.
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A case has been registered against the duo in this connection and efforts are on to nab the accused, police said.
In the third incident, a 21-year-old resident of Sector-22, Noida was raped by Haryana police constable Ramlakhan, police said.
As per the complaint lodged by the woman, the constable and the woman were residing together in a room in Ballabhgarh, following which they got married in a temple.
Later, the victim became pregnant and was asked by the accused to abort the child, police said.
Police have registered a case in this connection and further investigations are on, they said.