Kenyan police have arrested an official from Somalia’s militant Islamist group al-Shabab, security sources have told the BBC.
Police believe the suspect is former journalist Hassan Hanafi, who is accused of killing journalists in Somalia, other sources said.
However, the man has denied under interrogation that he is Mr Hanafi, the sources added.
Al-Shabab has carried out a spate of attacks in Somalia and Kenya.
Last September, 67 people were killed when the group’s fighters laid siege to the upmarket Westgate shopping centre in Kenya’s capital, Nairobi.
Somali security sources said Mr Hanafi was arrested a few days ago in Nairobi following co-operation between the intelligence services of the neighbouring states, reports the BBC’s Abdullahi Abdi from Nairobi.