A father, 55, and son, in his early thirties, died in an accident at Morong, about 30 kilometres away from Samdrup Jongkhar, at around 6 PM on Saturday.
They were heading back to Samdrup Jongkhar town from Wangphu Gewog in a mini-truck ferrying oranges.
The son was driving the truck that had one more passenger. The passenger sustained minor injuries and has been referred to Deothang hospital.
Samdrup Jongkhar police say the cause of accident is not known yet.
In last couple of weeks, three had died along the same highway in two separate accidents.