Said Jama Hussein, a businessman in Las Qorey, said there were now no more vessels in the area.
Correspondents say police in the region are investigating.
Somalia has been without a functioning central government since 1991, allowing pirates to operate in one of the world's busiest shipping lanes.
Earlier in June the European Union, which co-operates with Nato in the region, agreed to extend its anti-piracy operation there until the end of 2010.
Two dozen ships from European Union nations, including Britain, France, Germany and Italy, patrol an area of about two million square miles.
When first loaded, the map's focus falls on Somalia where most of the pirates are based. Use the arrow icons to scroll left towards Europe and the United States which are both playing a central role in tackling the problem.
Scroll to the right for a story about the Philippines, which supplies many of the world's mariners.
You can zoom in for more detail by using the "+" or "-" signs on the upper left hand side.
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