US chapter of BNP and its front organisations demanded immediate release of party chairperson Khaleda Zia and withdrawal of all cases against Tarique Rahman, reports US-based news agency News World.
In a statement they also said they would stage demonstration in front of the White House if Khaleda is not released immediately.
The former premier was detained irrationally during the month of Ramadan, the statement added.
They also protested the 'assault' to some BNP leaders on the day of Tarique's release and urged the BNP leaders and activists to remain united.