The interim government has imposed a curfew in Gopalganj from 8:00pm on Wednesday to 6:00 PM on Thursday.
The decision was conveyed by the chief adviser's press wing.
Earlier, groups of men tried to attack the National Citizen Party leaders shortly after the party's rally at Gopalganj's Municipality Park ended in the afternoon.
The attackers also set fire to the stage and chairs and tried to block the vehicles of the NCP leaders from leaving the area. Law enforcers used firearms to clear the road and took the NCP leaders to the deputy commissioner's office, reports our correspondent present at the scene.
The administration imposed Section 144 to calm the situation, said Muhammad Kamruzzaman, deputy commissioner of Gopalganj.
Four platoons of the Border Guard Bangladesh (BGB) were deployed in the area, said BGB spokesperson Shariful Islam.
The government in a statement released on the chief adviser's verified Facebook page said the violence was utterly indefensible.
"Preventing young citizens from peacefully holding a rally to commemorate the one-year anniversary of their revolutionary movement is a shameful violation of their fundamental rights. Members of the National Citizen Party, police and media were subjected to brutal attacks, with their cars vandalised and individuals violently assaulted," reads the statement.
The heinous act, allegedly carried out by members of the banned Awami League's Chhatra League and AL activists, will not go unpunished, it adds.
NCP leaders said the attackers were activists of the Awami League.
After the rally, when they were leaving the venue in their cars around 3:00pm, hundreds of people attacked the vehicles, some of which were carrying media personnel. Several vehicles were vandalised.
Police took action against the attackers, and a chase and counter-chase ensued between the two groups, said a Dhaka Stream reporter from the spot.
The NCP event was part of the party's planned appearances in all 64 districts of the country this month.
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