"Passport of rape accused minister Gayatri Prasad Prajapati has been impounded," ADG (Law and Order) Daljit Chaudhary told PTI here.
He said UP police will approach the Ministry of External Affairs to get the passport cancelled.
Chaudhary said Non-Bailable Warrant (NBW) had been issued against Prajapati and six others in connection with the case of alleged gangrape of a woman and attempt to rape her minor daughter.
Today's action came a day after airports across the country were alerted about the possibility of Prajapati trying to flee the country.
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Earlier in the day, at an election meeting in Jaunpur, Modi said, "In this country, when we do something good, we chant the Gayatri Mantra. But, the SP-Congress alliance is chanting the 'Gayatri Prajapati Mantra'.
"A case has been lodged against him (but) the chief minister went to campaign for him while he (Gayatri) was present there...Now, the police cannot trace him," Modi said.
Chaudhary said to ensure that Pajapati is arrested soon,
the Special Task Force of UP police has been roped in especially to prevent him from crossing the country's borders.
Uttar Pradesh has a long porous border with Nepal and is manned by SSB, a border guarding force of the Union Home Ministry which has also been alerted about the possibility of such a move by Prajapati.
A letter of cancellation is a technical term used for alerting immigration authorities about any possible move by a suspect to leave the country.
Whenever passport of the suspect comes for immigration clearance at any exit point of the country, the computer screen warns the official not to let the person leave.
The UP Police registered an FIR against the Samajwadi Party politician who continues to elude them, for allegedly gangraping the woman and molesting her minor daughter with his aides.