A prominent local religious leader has been arrested over multiple suicide attacks in northern Somalia.
At least 29 people were killed on Wednesday in five co-ordinated car-bombings in the autonomous Somaliland and Puntland regions.
Puntland security forces detained the Muslim cleric, Sheikh Mohamed Ismail, in a raid in the capital, Bosasso.
The BBC's Jamal Abdi in Somaliland's capital, Hargeisa, says foreign workers are being evacuated from the city.
The decision was reached after a meeting between international organisations and government officials.
Leads
Most of the casualties were in Hargeisa, where the presidential palace, Ethiopian consulate and UN offices were targeted.
Eyewitness: 'Terrible day'
In Puntland, six intelligence officers were killed in their offices after two suicide attackers struck.
Authorities in Hargeisa are following a couple of leads including the house where the bombs were assembled and the mart where the cars used were purchased, our correspondent says.
The authorities have halted an ongoing voter-registration process while they beef up security around the city.
No-one has claimed responsibility for the attacks, but the US has said it believes they were carried out by militants linked to al-Qaeda.
These were the first suicide attacks in the two relatively stable regions.
Somaliland has declared independence from war-torn southern Somalia but this has not been internationally recognised.
The region is a US ally in the fight against Islamist militants in Somalia.
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