Leaders and activists of the BNP and police became embroiled in sporadic clashes in Old Dhaka's Dholaikhal when the party was holding a sit-in in the area on Saturday morning.
The two groups chased each other at around 11:30am.
At one point law enforcement fired tear gas at the protesters while BNP men lobbed crude bombs at police.
The BNP at a rally on Friday announced that it was going to hold sit-ins at different entry points of Dhaka on Saturday to press home its demand for the general election to be held under a non-partisan government.
