A group of masked armed men stopped vehicles on a hilly road in Cox's Bazar on Monday and robbed more than 100 passengers, taking many of them into the nearby forest and beating them, according to police and victims.

The attacks took place in two phases, around 8am and again around midday, at Himchhari Dhala on the Eidgaon-Eidgar-Baishari road, which runs through the hills of Eidgaon and Ramu upazilas. Victims said the gang, made up of 10 to 12 men, held up 50 to 60 vehicles, mostly CNG-run autorickshaws and motorcycles, over about two and a half hours.

Eidgaon Police Station Officer-in-Charge ATM Sifat-ul Mazdar confirmed the robberies. He said local criminals had blocked the road, looted the vehicles and fled into the forest. Several police teams were sent to search the area and patrols were increased along the 17-kilometre road, but no arrests had been made by Monday evening, he said. The officer could not confirm the exact number of vehicles involved.

Victims described being forced off the road and taken into the forest. Robiul Islam, manager of an NGO's Eidgar branch, said he was riding a motorcycle from Eidgaon Bazar to Eidgar around noon with another person when the gang stopped them. They were beaten and robbed of Tk1.2 lakh in cash, two mobile phones and documents, he said.

Abdul Hakim, an accountant at another NGO's Eidgar branch, said he was travelling in an autorickshaw with two others when armed men intercepted them. They were taken into the forest, assaulted and robbed of Tk1.5 lakh and a bank cheque book, he said.

Another victim, Mohammad Tarek, said he escaped by jumping from a moving autorickshaw after the gang stopped it in the morning. His mobile phone was taken.

Residents of the area said robberies and kidnappings for ransom have recurred on the road, and called for stronger security for commuters. Police said they were continuing operations in the forested sections.

The road is a busy link for people travelling between Eidgaon, Eidgar and Baishari, with long stretches passing through remote hills and forest.