UNB, Dinajpur :Nine members of Bangladesh Army were injured in a grenade explosion during a training at Kholahati Shaheed Mahbub Cantonment in Parbatipur upazila on Wednesday. Sources at Rangpur Cantonment said a grenade went off accidentally during the training at the Firing Range of the Kholahati Shaheed Mahbub Cantonment around 4pm, leaving the nine Army men injured.Four of the injured were rushed to the Combined Military Hospital (CMH) at Rangpur and five others sent to the CMH in Dhaka as their conditions were stated to be critical.