The teenage girl gave poison-laced tea to her mother Sangita, following which her condition began deteriorating and she was rushed to a hospital, they said.
A Greater Noida resident was punched and assaulted with sticks at a busy roundabout by some locals over a dispute allegedly in the presence of police and their official vehicle barely a few metres away.
Aurai SHO Jai Prakash Yadav said the girl is missing since the incident and a team of the State Disaster Response Force (SDRF) has been working since Sunday morning to find her.
After the death of the couple, their relatives approached the police and lodged a complaint at Basantwara police station alleging that the woman was gang-raped by two men.
A love affair took a brutal turn and led to the death of two persons after a man was caught in a girl's room in Jhanjhwa village in Ambedkar Nagar district on Tuesday night.
The incident was brought to light when the girl's mother filed a complaint, leading to the police registering an FIR under IPC section 376 and sections 5/6 of the POCSO Act on Tuesday.
The men, residents of Gondalpur village in the Maharajganj area, were taken to a primary health centre where Shivkumar Bind was declared dead, he said.
The five men were arrested near Hathinala area by a police team on Thursday morning, they said, adding that two of their accomplices managed to flee from the spot.