Main accused Abhay Singh Yadav is a bad character as per records at Hauz Qazi police station in the capital and has been previously involved in seven criminal cases.
He along with five others was arrested for assaulting Ansar Alam, Executive Engineer of City Zone of MCD, on February 7 near Delight Cinema when he was travelling in a bus.
The case was transferred to the Crime Branch for investigation after Delhi High Court took congnisance of the incident. Police had also declared a reward of Rs 50,000 for information on the accused.
After months of investigation, police finally zeroed-in on Abhay Singh Yadav and arrested his associates Harjeet and Nitin Pahelwan.
Harjeet knew Yadav because of his links with his late brother Ajay Yadav during their stay in jail.
"Abhay Singh Yadav called Harjeet and Nitin to his house at civil lines and asked for their help to attack the officer. He told them that Alam is an honest officer and that he was not allowing him to work in the area," Sanjay kumar Jain, Deputy Commissioner of Police, Crime and Railways, said.
Abhay Singh also promised to give them a handsome amount for assaulting the engineer.