Chittagong: Detectives arrested two more suspects from separate places in Chittagong in connection with murder of police super Babul Akter's wife Mahmuda Khanam Mitu.

The arrestees were Saiful Islam Saku, brother of prime accused Musa and Shahjahan.

DB police arrested Saku from Rangunia upazila early Friday and Shahjahan from Oxygen More area of city on Thursday night, said Assistant commissioner of DB Mohammad Kamruzzaman, also the investigation officer of the case.

Saku supplied the motorcycle which was used in the killing mission, he said.

Earlier on Wednesday, Chittagong Metropolitan Police (CMP) slapped a travel ban on five suspected killers including Shahjahan.

On June 26, two murder suspects-Wasim and Anwar, believed to be professional killers hailing from Rangunia of Chittagong- reportedly confessed before a court to their involvement in the killing.  

Miscreants gunned down SP Babul's wife Mahmuda Khanam at GEC intersection of the port city of Chittagong on the morning of June 5 while she went there to drop her son Mahir Akhter, 7, for his school bus.