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RANCHI: A Hindi teacher Nazia Hussain (wrongly reported as Nezma Khatoon earlier) of Sapphire International School along with her 16-year-old son Sharif Ansari (name changed), husband Arif Ansari and daughter were arrested on Wednesday for allegedly killing a Class VII student Vinay Mahto on Friday because "the boy had a crush on her 12-year-old daughter which her son did not like".The body of the boy, Vinay Mahto, was found outside the teachers' quarters where Nazia (in her late 30s) lives with her husband and two children."The teacher and her family were upset about Vinay's friendship with her 11-year-old daughter. The teacher's son, a class 11 student of the same school, invited Vinay for a dinner with his sister and managed to lure him to his house on Thursday night. He told him that his mother would cook something special for them," a police official said.Ranchi SSP Kuldeep Dwivedi said Vinay was in love with the girl, a class junior to him in the same school. "Sharif was continuously teased by his friends about the alleged affair his sister was having with Vinay. It led him to develop a strong hatred for Vinay. The entire family was pained with the relationship," the SSP said.On Thursday, Sharif met Vinay at the basketball court and invited him for dinner with his sister at the teachers' quarter after midnight. Vinay readily agreed. Sharif asked Vinay to come after midnight when no one in the campus would be able to see him."At 1.09am, Vinay came out of the hostel and went towards the teachers' quarters (CCTV footage confirms the movement). He went straight to Nazia's room where he sat on the dining table with Sharif. Over dinner, Sharif asked him to break all relations with his sister, to which Vinay refused. An argument ensued and Sharif suddenly covered Vinay's mouth with one hand and punched him several times on his stomach. He pushed him to the wall and banged his head on the wall. Vinay collapsed due to the injuries," SSP Dwivedi said.The postmortem report has confirmed liver puncture due to hurt.The scuffle woke Nazia and her daughter sleeping in one of rooms of the two bed-room flat. "Nazia rushed to the dining room and saw the unconscious boy bleeding. They thought that the boy was already dead. In panic, they dragged the body to the corridor and threw it off their first floor balcony," Dwivedi said.An android camera has captured the audio of footsteps (when Vinay was being dragged out of the room by teacher and her son) at around 1.20am in the first floor corridor."The audio clip has the sound of door being opened followed by footsteps and then a big thud (the falling of the boy on the ground). Then the teacher and her daughter used wiper to clean possible blood stains in the corridor and then closed the door. The sound of the wiper has also been recorded in the camera. The camera could not capture image because it was dark," ASP Hatia Prashant Anand, who monitored the probe at the ground, said.The audio clip has established the sequence of the plots of the crime. "The husband was not present at the crime scene. But he was arrested because he helped them destroy the evidences," the police said.The police spoke to the girl but were unable to conclude whether she also loved the boy. "The girl is in a state of shock and unable to speak on the subject," a CID officer said. ASP Anand said all the accused have confessed to the crime.Blood stains were found on the curtains, floor and wall of the room by the police. "The blood samples collected from their room were sent for forensic tests. The tests confirmed it was the blood of Vinay," a police officer.The mother and son were booked under Section 302 of the IPC for murder while the daughter and her father were booked under section IPC 201/202. All the four have also been booked under Section 34 of the IPC for abetment to the crime. "Initially we were working on multiple theories including sodomy. As the investigation progressed, several theories were ruled out and we zeroed in on the accused," city SP Kishore Kaushal said.The couple belongs Rewa in Madhya Pradesh.