In a press statement, the Lucknow SSP office said King George's Medical University doctors today conducted a forensic examination of the burn injuries the 45-year-old woman had received on her face and neck.
It also said an FIR was filed by the victim's husband and the field unit of the police visited the crime scene.
The police team found no evidence to suggest presence of acid at and around the spot the woman was found lying in the hostel, the release said.
Therefore, it is clear no one from outside had come into the hostel and thrown acid on her, it concluded.
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The woman, who hails from Raibarely, has yesterday alleged she was attacked with acid at her hostel the previous night- the fourth alleged acid attack on her in eight years.
She had alleged the attackers had fled by climbing the wall as she raised an alarm.
Chief Minister Yogi Adityanath had yesterday expressed doubts over the incident, saying it may have been staged to defame his government.