The maximum checks occurred in districts like Hardoi, Rae Bareli and Lakhimpur Khiri, he said in a statement.
"The incident took place a week back, but the police were informed about the alleged gang-rape on Sunday," Superintendent of Police (Kanpur Dehat) Keshav Kumar Choudhary said.
A third woman was also in the cab and was rescued by locals who chased and intercepted the vehicle when they saw the duo jumping out of the taxi, police said, adding that the driver was later arrested
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Additional Superintendent of Police R S Gautam said the post-mortem examination has confirmed that the woman was raped before she was strangled.
The victim's father alleged that after raping his daughter, the accused left her with her hands and legs tied and the police brought her back, but did not register an FIR.
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Gehlot added that when Rahul Gandhi had visited Rajasthan after the Thanagazi incident many changes were made to the police system and now their priority is to help the complainants get justice.
The law ministry later issued a statement, saying from now on the 'death penalty' instead of 'lifetime rigorous imprisonment' would be the maximum punishment for rape.
The three are undergoing treatment at the district hospital and they are out of danger, according to doctors.
A case has been registered against the 20-year-old accused on the basis of a complaint filed by the girl's mother, they said.
The upper castes hound the Dalits to such an extent that many are forced to flee their village and relocate elsewhere, where they struggle for a living without government support.
Police said the family members have alleged that she was killed after she was raped, which can be confirmed only after the postmortem examination report comes.
The 19-year-old Dalit woman from Uttar Pradesh's Hathras had died at Delhi's Safdarjung hospital on September 29.
Tension gripped when they suddenly barged into the premises and entered Mahmood Ali's house by opening the main gate.
According to the victim's family, she was allegedly raped on July 19 and ended her life the next day.