Somali government forces and Ethiopian troops have shelled areas of Somalia's capital Mogadishu after their positions came under fire from insurgents.
At least 12 people, mostly civilians, were killed in the exchanges - the heaviest since the government took Mogadishu from Islamists last year.
Unknown gunmen launch almost daily attacks in the city.
Some Islamists, who last year were controlled much of southern Somalia, have vowed to start a guerrilla war.
The government blames the attacks on Islamist fighters and on Monday set up a special unit to target "terrorists".
Dozens of people have been killed during attacks this year.
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