A man and his son are on the run after allegedly beating up a MSEDCL assistant engineer in Thane district, the police said on Monday.

Ashok Dharma Choudhari and his son Amit, residents of Ojiwale, hit the engineer after the state-run power firm disconnected supply to their premises on Sunday due to non payment of bills of Rs 12,000, said Assistant Inspector Santosh Darade of Tokawade police station.