Somalia's prime minister says the president will announce a "state of war" against the al-Shabab extremist group blamed for the country's deadliest attack.
A military official says the United States is expected to play a supporting role in the new offensive.
The official spoke on condition of anonymity because he was not authorized to speak to reporters.
Somalia's army spokesman Captain Abdullahi Iman says the offensive will try to push al-Shabab fighters out of strongholds in the Lower Shabelle and Middle Shabelle regions where many deadly attacks on Somalia's capital are launched.
Al-Shabab has not commented on Saturday's truck bombing that left 358 dead and dozens still missing.
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