Unidentified persons lobbed a molotov cocktail at a BJP office here partially damaging it, a police officer said Monday.
No casualty was reported in the explosion.
The office was attacked before Tuesday's proposed North East bandh called by the North East Students Organisation, an umbrella organisation of students' bodies of the region, in protest against the prime minister's announcement to pass the Citizenship Bill.
An investigation has been initiated into the bomb attack on the BJP office, said Davis N R Marak, superintendent of police of East Khasi Hills district in which Shillong falls.
"Unidentified men attacked the front portion of the office partially damaging it. The incident was reported around midnight last night," BJP state president Shibun Lyngdoh said.
The office does not have CCTVs installed and hence it is up to the police to identity the assailants, he said.
Protests were on in various places of the region over the Citizenship (amendment) Bill.
The Bill was introduced in the Lok Sabha to amend the Citizenship Act, 1955. It seeks to grant citizenship to people from minority communities - Hindus, Sikhs, Buddhists, Jains, Parsis and Christians from Afghanistan, Pakistan and Bangladesh after six years of residence in India instead of 12 even if they do not possess any proper document.
The Bill has been opposed by a large section of people and organisations in the Northeast.
Meanwhile, the Meghalaya unit of the BJP has condemned the attack on its office and requested the police to tighten security in all its offices across the state.
"The state unit of the BJP has strongly condemned the act of arson in its state headquarters at Bivar Road," BJP Minister A L Hek said in a statement.
An FIR was lodged and copies of it were also sent to the Chief Minister and Home Minister requesting stern action against those involved in the crime, he said.
Hek, who is also the BJP legislature party leader, said the party has also requested the police to deploy security personnel in all its offices across the state to prevent such incident to take place.
The BJP, having two MLAs, is part of the ruling Meghalaya Democratic Alliance government headed by Conrad K Sangma of the National People's Party as the Chief Minister.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)