A conman who has been soliciting money from MPs has closely related with the legislators, detectives have said.
According to Director of Criminal Investigations George Kinoti, the suspect has a "special relationship" with the complainants.
Several lawmakers complained in the House last week that they were being blackmailed by a conman soliciting cash from them.
On Thursday, the National Assembly Security committee went into private session after Kinoti said he could not divulge further information on the matter in the full glare of the media.
On Tuesday, Kinoti promised the committee that he would, in 24 hours, arrest individuals who have been harassing MPs.
Besides blackmail, the lawmakers had complained about receiving nude photos from an unknown woman who put their marriages at risk.
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The DCI boss disclosed that some of those behind cyberbullying were "powerful individuals" hence the need for protection by investigating officers.
"Have confidence in us. We have the capacity to deal with these matters. Some of the sponsors of the crimes are among us," Kinoti said.
"We will act. That’s what I’m promising," he told the team led by Paul Koinange
at Continental House in Nairobi.