
The law keepers have also searched and locked the party's central office at Naya Paltan.
"Khaleda Zia has been besieged by the law-enforcing agencies since 11:40pm," her special aide Shamsur Rahman Shimul Biswas told reporters around 1am on Sunday.
Earlier, detective police picked up BNP's Joint Secretary General Ruhul Kabir Rizvi from the party's headquarters.