The woman and her paramourwere arrested from their Attibele residence for killing her daughter.
The woman was in love with her relative, whoworks in a petrol pump, they said.
On Tuesday night, she left home with her daughter on the pretext of getting her (daughter) treated in a hospital.
Later, she strangled her daughter near a hospital and fled with her paramour after dumping the body in a layout near Yadavanahalli, they added.
Meanwhile, the woman's husband lodged a missing complaint about his wife and daughter.
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The CCTV footage obtained from the spot gave details about the accused.
After a manhunt, the duo were caught, police said.
The woman said she killed her daughter to remove the obstacle from her relationship, the police added.
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