Police recovered three AK 47 rifles and 178 bullets during an operation targeting a former Recce Squad officer on Thursday morning.
This followed suspicion that the man had been radicalised by al Shabaab and was planning an attack at the GSU Recce headquarters in Ruiru.
The suspect has been identified in police documents as constable Eric Ngethe, No 97861, who deserted his Job as an officer of the elite squad in 2014. He was a highly trained hostage and rescue officer.
The search for him was intensified after intelligence reports warned of a possible terror attack. He escaped without the weapons during the dawn operation.