An Indian worker was injured in an IED blast in poll-bound Bhutan's Phuentsholing district, police said on Tuesday.
The improvised explosive device (IED) was placed in a bush about 40 metres from the Bhutan Oil Distributor's petrol pump in Pasakha, a Royal Bhutan Police spokesman said.
The Indian worker was injured by a splinter in the explosion that took place on Monday.
The police say they expect more explosions that are aimed at preventing people from participating in the country's March 24 National Assembly elections.
The explosion at Pasakha comes just two days after a blast was reported in Tshochungkha village under Sampheling district.
A transmission tower was damaged by the explosion on Saturday. There were, however, no reports of casualties.
Police had found two letters, one written in English and the other in local dialect, at the explosion site.
A militant group calling themselves the United Revolutionary Front of Bhutan claimed responsibility for the blast.
The group also claimed responsibility for the four bomb blasts on January 20 in which one woman was injured.