Attacks, some claimed by the Pakistani Taliban, have risen, mostly targeting police and security officials
The dead are Kazi Md Mainul Alam, 36, and Farhana Islam Tania, 30, Anandabazar newspaper reported citing police.
Mainul, hailing from Jhenaidah, was working as retail support manager of Grameenphone.
Tania, a resident of the capital’s Mohammadpur, was a Citibank official working at its Dhanmondi branch.
The injured, Kazi Md Shafi Rahmatullah, is Mainul’s cousin. Rahmatullah’s injuries were not serious, according to the Indian media.
A Jaguar car rammed into them after hitting a Mercedes Benz sedan around 2am, the Indian media said.
He is a student at Edinburgh and was home for holidays, according to NDTV.
Police were seeking his custody after the arrest, Anandabazar said.