Narayanganj/ Bogra, Dec 02 (ANI): Violence erupted in parts of Bangladesh as opposition parties went on a rampage, burnt vehicles, exploded crude bombs and sabotaged railway tracks amid the ongoing 72-hour blockade called by them to oppose the upcoming polls in the country. Reportedly, three passengers in Narayanganj district sustained burn injuries as agitators set their vehicles on fire. The Bangladesh Nationalist Party (BNP) had called for 72-hour blockade of roads, railways and waterways across Bangladesh starting from Saturday morning.