Gali Sridhar, General Manager (Technical), NHAI, posted in Madurai, Sudhakar Vaduppu, Assistant Manager, Hyderabad-based NSS Infrastructure, private persons Sai Prasad and Pawan, an employee of Vaduppu have been arrested by the CBI, they said.

"It was also alleged that the general manager (Technical), National Highways Authority of India Limited (NHAI) demanded a bribe of Rs 27 lakh in Hyderabad for clearing bills of the said private firm pertaining to ongoing work at NH 7 Madurai ¿ Kanyakumari stretch of Tamil Nadu," a CBI spokesperson said here.