Three young men who left Isiolo County two weeks ago on their way to Somalia have been intercepted.
The three, who were part of an initial group of six, were arrested at Dagahaley refugee camp.
Isiolo County Commissioner George Natembeya on Monday said the other youths from Tullo-roba were still missing and are suspected to be on their way to join the Somalia-based Islamist group.
The suspects are said to have travelled from Isiolo to Garissa on motorbikes. They carried reserve fuel in containers and spare wheels.
He said detectives were following leads after their parents reported their disappearance. The six were friends aged below 35 years. The suspects are to be returned to Isiolo by police for interrogation.
“Police were informed about the presence of the three at the camp as they seemed suspicious. They were on their way to Somalia,” said Mr Natembeya.
Police have questioned several people believed to be recruiting young people in Isiolo to join Al-Shabaab.