Police have arrested BNP joint secretary general Syed Moazzem Hossain Alal from its Nayapaltan central office area in the city, UNB reports.
Law enforcers picked him up when he came out of the office after holding a press conference there on Saturday.
Earlier in the day, police foiled BNP's black flag showing programme in front of its central office protesting the denial of permission to hold a rally in the city.
BNP on February 22 announced the programme protesting the denial of permission for its planned rally on Thursday demanding the release of party chairperson Khaleda Zia from jail.
BNP earlier sought police permission to organise a public rally on February 22 either at Suhrawardy Udyan or in front of its central office. But the police didn't give permission to the party.
On February 8 last, BNP Chairperson Khaleda Zia was sent to jail after a special court sentenced her to five years' rigorous imprisonment in the Zia Orphanage Trust graft case.