Rapid Action Battalion (RAB) arrested BNP joint secretary general Ruhul Kabir Rizvi from a house in capital's Baridhara area early Saturday.
BNP chief's media wing member Shamsuddin Didar said, a team of RAB-1 raided the house and arrested Rizvi around 2:45 am.
Rizvi, who had been releasing statements from a hideout for the past few weeks, called another 72-hour hartal from Sunday morning.
On January 3, police picked up Rizvi from BNP's Nayapaltan central office and admitted him to Apollo Hospital.
Rizvi left the hospital on January 7 without informing the hospital authority and went into hiding.