A week after a cash collection agent was robbed of Rs 1.78 lakh on a highway in Palghar district of Maharashtra, police have arrested six members of a gang allegedly involved in the crime, an official said on Wednesday.

The personnel of Mira Bhayandar-Vasai Virar (MBVV) police commissionerate took the action, he said. "On April 7, victim Santosh Pandey (31), was going on his two-wheeler after collecting cash from a shop. He was carrying with him Rs 1,78,900. When he reached Rajavali on the Mumbai-Ahmedabad highway, four men pushed his vehicle, due to which he fell down. They later ran away with the cash," said inspector Pramod Badhak of MBVV police's Virar crime unit.