ASI Dileep Singh (50), who was on the run, was arrested yesterday, police said.
According to the 30-year-old victim, she had visited Mianwali Nagar police station for seeking help to solve a matrimonial dispute.
She met Singh, who demanded sexual favours for helping her out, police said.
Singh called her to a flat on Tuesday on the pretext of solving her issue where he raped her, they added.
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