Chittagong police today alerted all airports and land ports in the country so that the five suspected killers of Mahmuda Khanam Mitu, wife of Superintendent of Police Babul Akter, cannot leave the country.

“Letters were sent to different ports of the country to ensure that the five suspected killers cannot leave the country,” Assistant Commissioner Mohammed Kamruzzaman, investigation officer of the case, told The Daily Star.

The five suspects are Musa, Rashed, Nabi, Shahjahan and Kalu.

READ MORE: 7-8 killers took part in the mission

Six people have been held in this case so far. Two were shown arrested, who, according to police, confessed killing Mitu before a Chittagong court.

So far, what police said is Wasim, one of the detainees who was shown arrested, was one of the three people who attacked Mitu.

On June 5, three assailants stabbed and shot Mitu dead when she was taking her son to his school bus stop at GEC intersection in the port city.

She was the wife of SP Babul Akter, a cop who spent most of his time curbing militancy. But now, there has been a whisper of his involvement in the murder.