At 10.30pm on Saturday, a group of suspected armed and camouflaged militants had appeared in the office at Rangamati, located on the border of Assam, Tripura and Mizoram, and kidnapped Arindam at gunpoint. Police in all three states had launched a joint rescue operation.
Police said Arindam Kar (35), a supervisor in CPM's forest department, was released at Damchaerra in Mizoram. After receiving a report, Assam Police coordinated with its counterparts from Mizoram and brought a visibly-weak Kar back to Karimganj. He was sent for a medical examination before being interrogated.
The name of the militant outfit involved in the kidnapping was yet to be determined, said police sources. They added that Kar's release was secured by a hefty ransom. However, police remained tight-lipped about details.