Chennai, Dec 8 (Inditop.com) Six unidentified men robbed about 20 bus passengers travelling from Chennai to Thanjavur in Tamil Nadu, police said Tuesday.

According to police, the state government bus left for Thanjavur from here at 7 p.m. Monday. While the bus was near Jayamkondan, it stopped at Meensuruti and some passengers got down.

At the same time, four people alighted from a Tata Sumo and boarded the bus, saying that they would like to go to Thanjavur.

After some time, one of the four went near the driver and held a sickle at his neck and ordered him to stop the bus.

Another snatched the cash bag held by the conductor. Two other passengers, who were travelling in the bus, then joined the four and started threatening the passengers and robbed their valuables.

A police inspector, who was travelling in the bus, tried to prevent the robbery but was attacked and pushed out of the vehicle. His mobile phone was snatched by the robbers.

Later a Tata Sumo stopped near the bus and all the miscreants fled in it.

The Jayamkondan police have registered a case.