Two minors were arrested by the Thane anti-extortion cell for robbing a man of Rs 8,000 and assaulting him.
The incident took place on Friday night when a man had stopped on the highway to relieve himself.
The accused, who are the resident of Lokmanya Nagar, pada no-4, were arrested within 12 hours of the incident as their bike number was noted down by an alert cab driver.
The police said that the minors have a record of extorting money from the people on the street.
The two have been kept at Rabodi police station. They have been arrested and the motorcycle used in the crime has been recovered from them.
Police are further investigating the matter.