The militants lobbed the bomb at the house of the executive engineer of planning and development authority (PDA), Loitongbam Keisho, at Kwakeithel Konjeng Leikai area near Imphal airport in Imphal West district late last night but no one was injured in the explosion.
The official and his family members were present at the time of the explosion, sources said adding that nearby police station have registered a case for investigation in this regard.
The All Jiribam Meira Paibee (AJMP) in a general public meeting yesterday appealed militants to stop extortion.
An extortion demand was made to the United Bank of India (UBI) branch at Jiribam, about 222 km from here, by militant outfit URG (United Revolutionary Front), a spokesperson of the AJMP said adding that the branch has closed since September 19 due to the threat.
He said the closure of the bank has caused inconvenience to the people in the sub-division as it was not only the bank in the sub-division but also the only bank from where people also drew widow's pension and old-age pension.