The latest of such killings was those of policemen on stop and search duty in Abuja.
He told them to ensure that the screening exercise, which will commence on May 7, 2018, is smooth, hitch free and devoid of any form of corrupt practice.
This followed the escape of Melaye from the Nnamdi Azikiwe International Airport, Abuja, where he was earlier prevented from travelling out to Morocco by policemen and operatives of the Nigeria Immigration Service.
Isa said that the first four suspects Joshua Yohanna, 22; Musa Ibrahim, 25; Nafiu Umar, 32; and Kabir Lawal, 28; were arrested in Kafur Local Government Area of the state.
Don Awunah, the State Commissioner for Police, represented by his Deputy, Abiodun Alabi of the Department of Finance and Administration, declared open the two-day training programme in Yenagoa.
Idris gave the order at the monthly meeting with Commissioners of Police and above on Monday in Abuja.
Police said emergency services were called at 8:30 am (0030 GMT) to a report that three people were injured inside a hotel room near Victoria Harbour.
Inuwa said the suspects were arrested by a team of policemen attached to the Operation Skolombo Special Task Force set up by the State Government to mop up street urchins and other criminals in Calabar.
He explained that the suspects allegedly conspired and abducted the victim at his residence at Mahucin Sarki quarters, after they learnt that he produced fake money.
Danmallam told the News Agency of Nigeria at the Enugu State Independent Electoral Commission headquarters, Enugu that he was pleased with the security arrangement.
Asuquo Amba, the Police Commissioner in the state, told journalists in Yenagoa that some of the items recovered from the suspects included firearms, vehicles and cell phones.