Imphal, 26 January 2017 ( Evening News ) : Despite the tight security measures taken by the police to prevent untoward incidents during the Republic Day celebrations, a bomb exploded this morning. However there was no report of casualty. The explosion occurred this morning around 8 near the western wall of Manipur College near Pishum bridge. The blast created a big hole of about 3 feet diameter on the fence wall. Police and IRB personnel who were on duty rushed at the spot and inspected the damage. Police suspect that the bomb was not a powerful IED. The explosion took place when people were trying to save a drunkard from the Nambul river about 10 feet from the spot. Fortunately the blast caused no injury. No one has claimed responsibility for the blast. It may be recalled that some underground outfits have called for boycott of the Republic Day celebrations.