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The U.S. military says the situation remains "fluid" after the pre-dawn attack by the al-Qaida-linked group.
Kenya's military says five attackers were killed. It is not clear whether U.S. or Kenyan forces were killed.
The Somalia-based al-Shabab says the attack has nothing to do with the Middle East crisis.
This is the first known al-Shabab attack against U.S. forces inside Kenya, a key base for fighting one of the world's most resilient extremist groups.
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