Two Britons are being held by police in Kenya after being arrested near the border with Somalia.
The pair are believed to be from Cardiff and South Wales Police are trying to find out why they were detained, a spokesman said.
A statement from the force said: "South Wales Police are currently in liaison with the Kenyan authorities in respect of two British nationals who have been detained near to the border with Somalia.
"The identities of these persons have yet to be formally confirmed, both are believed to be from the Cardiff area. The families of these persons have been notified.
"These persons are being detained under Kenyan law and the force is liaising with local law enforcement to establish the circumstances of their detention.
"South Wales Police is also in contact with the Foreign and Commonwealth Office and the British Embassy in Nairobi."
A Foreign Office spokesman said: "We are aware of reports of two British nationals detained in Kenya on October 16 and we are seeking normal consular access."