The officers, who had mounted a road block along the highway, had asked the driver to stop but he ignored the orders and fled, raising suspicion.
The officers opted to follow the vehicle in a chase that lasted for more than one hour.
Rongo Sub-county Police Commander Peter Okiring confirmed that culprits abandoned the vehicle and jumped into River Kuja.
The abandoned vehicle had bhang weighing 1.94kg which had been packed in five sacks and was being ferried to an unknown destination.
On their way to the station, the police officers bumped into another vehicle (Probox) which they suspect was ferrying the suspects. However, the suspects also deserted the vehicle and escaped.
The two vehicles have been towed to Kamagambo police station and the bhang seized.
A similar incident took place three days ago after police in Isiolo seized bhang worth Ksh855,000 that was being transported by a personal vehicle along the Isiolo-Moyale road.
The vehicle, which had five students, was intercepted by a multi-agency security team at Archers Post.
“We suspect the bhang was from Ethiopia and was being transported to Nairobi,” Isiolo County Police Commander Joseph Kigen stated.
Kigen warned that inspection of vehicles in the area had been intensified and culprits would be brought to book.