Rapid Action Battalion has detained four people, including the alleged mastermind, in connection with the murder of Awami League leader Zahidul Islam Tipu and a college student in Shahjahanpur.
The identities of the detainees could not be known immediately.
The elite force nabbed them from different parts of Dhaka today, said Imran Khan, assistant director (media) at Rab headquarters.
"A man who tailed the AL politician's vehicle is among the detainees," he said.
On March 24, criminals opened fire targeting Tipu's microbus that was stuck in a traffic jam in the Shahjahanpur area. Prity, a student who happened to be on a rickshaw next to the microbus, also got shot. They both were declared dead at Dhaka Medical College Hospital.
The next day, a case was filed against unidentified people over the double murder.
On March 27, police arrested Masum Mohammad alias Akash (34), the prime accused in the double murder case from Bogura. The next day, a Dhaka court placed him on a seven-day remand.
A second suspect was arrested by Dhaka Metropolitan Police detectives from the city's Kamalapur area on March 31.
Tipu was a former general secretary of the AL Motijheel committee while Prity was a student of Begum Badrunnesa Government College. Tipu's driver was also injured in the firing.
