Police in Thika have arrested three people in connection with the theft of Sh50 million from KCB bank through an underground tunnel.
Area police boss Adiel Nyange said the two men and a lady were arrested on Monday and are helping with investigations into the incident.
"One is an agent and the other two are custodians of the keys that open these exhibition shops. They will assist us in our investigations."
He said those behind the burglary had rented three stalls in a building next to the bank from which they pretended to be selling books.
"It was from here, since June, that they dug the 30-metre long tunnel which was linked to an exhibition stall in a building next to the bank."
Nyange said the suspects stashed soil in cartons and carted the same out of the premises in a package disguised as books.
"In fact, they could even put a book on top of a carton. No one would suspect they were ferrying soil," the police boss said.
The county police commander said the investigation will also explore whether bank officials were involved in the crime.
"It is still early to say whether it was an inside job. Investigations will determine so," Nyange said.
In a statement, police said they received the information following a report by the bank manager.
Samuel Nganga told the officers he found cash had been stolen from two safes after opening the vault at 8.30am.
"They broke into two safes...it is believed they used oxy-acytelene flames to drill holes into them," police said.
Read: