"The successful elimination of Mustafa Haji Mohamed was the action of the mujahedeen who are committed to killing all MPs," a Shebab official who asked not to be named told AFP, saying the group would "kill one-by-one" the country's remaining 274 lawmakers.
Mustaf Haji Mohamed, the father-in-law of former president Sharif Sheikh Ahmed, was gunned down on Saturday after leaving a mosque in Mogadishu, the first lawmaker to be targeted since the new assembly was selected in August.
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Somalia's new President Hassan Sheikh Mohamud survived an assassination bid on September 12, just two days after he was elected, when apparent suicide bomb attacks claimed by the Islamist rebels rocked a Mogadishu hotel.
After more than two decades of war, Mogadishu has been coming back to life since the Shebab left frontline fighting positions, with a boom in building and business.
However, the Shebab have switched to guerrilla attacks -- including suicide bombings -- and remain a potent threat.
