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Islamist fighters in Somalia's capital, Mogadishu, shot at a crowd angered at shortages of the mild stimulant khat, killing one person, say eyewitnesses.
Khat vendors were protesting about loss of revenue since a ban on Kenyan flights to Somalia on Monday, that has led to a shortage of imported khat.
The Islamists have subsequently burned two big khat consignments which were flown in from elsewhere this week.
The Islamic courts have tried to outlaw khat since they rose to power in June.
The Union of Islamic Courts (UIC) that now rules the capital says khat encourages immorality.
Most khat, chewed by many Somali men - especially the gunmen who have fought for control of the country for the last 15 years - was flown in from neighbouring Kenya.