A group of the National Democratic Front of Bodoland fired 15 rounds on the vehicle of Mahalaxmi Tea Estate proprietor Adilur Rahman at Nagda on the Assam-Arunachal Pradesh border as he was driving with his security guard towards Baihata Chariali, police sources said.
The planter of the garden was killed and his security guard, Motilal Tirke, belonging to the Assam Tea Protection Force, was grievously wounded, they said.
Tirke was referred to the Gauhati Medical College Hospital, the sources said.
Senior civil and police officials reached the spot after the incident.