More than a dozen people have been killed and others displaced in the clashes that become rampant near and during elections time.
DCI boss George Kinoti said they are interrogating the two to establish if there are more suspects in the ring.
“Such weapons can be used for even terror purposes or kill innocent people. We are digging further to know if there were other players,” he said.
Tension has been building in the area with more local militia amassing weapons for planned attacks for political reasons.
Last month, police seized more than 2,000 bullets used for AK-47 rifles that were destined for Isiolo in an operation in Nairobi.
A senior officer stationed at the General Service Unit Training college in Embakasi was arrested and is facing charges in court.
At least five other GSU officers linked to the supply of the bullets from government stores are either missing or dead.
Two others were killed in unclear circumstances along Mombasa Road and in Utawala area.
Police have denied involvement but many think it was a state sanctioned operation to clear the gang behind the ring supplying live ammunition to criminals.
Some of the bullets that had been recovered in ongoing operation in Laikipia were traced to government stores raising alarm of a serious ring in the police that is compromising security hence investigations and said action.
In Laikipia, more than ten people have been killed in the attacks mostly from armed herders.
The government is conducting a major operation in the area and has resettled those who were displaced by the clashes.
Edited by D Tarus
