Police have detained around 35 BNP leaders and activists, including the party's Senior Joint Secretary General Ruhul Kabir Rizvi Ahmed.
The party's Joint Secretary General Khairul Kabir Khokan, its Dhaka city north unit convener Aman Ullah Aman and BNP leader Abdus Salam are also among the held.
Police detained them from BNP's Nayapaltan central office in capital Dhaka around 5:30 pm on Wednesday.
Earlier this afternoon, police and BNP men clashed in front of the party office that left one dead and several injured.
The deceased was identified as Makbul Hossain, 40, but it could not be confirmed whether he was BNP activist.
Witnesses said BNP leaders and activists started gathering in front of the party office this morning and a huge crowd was seen this afternoon.
The clash ensued when police lobbed tear shells and rubber bullets to remove BNP men from there.
Before being detained, Ruhul Kabir Rizvi claimed more than 100 leaders and activists of the party were hurt in the police firing and most of them are bullet-hit injured.
Joint Commissioner of Dhaka Metropolitan Police Mehedi Hasan had, however, alleged BNP men aggressively attacked police at Nayapaltan and tried to create a 'ring of terror' in the entire area.
DMP has taken action to keep the law and order situation normal, he added.
Earlier around 12 noon, police deployed armour vehicle, prison van, and additional striking forces in Nayapaltan area.
KH/SU