Somalia-based Al Shabab claimed responsibility for the attack on a miners' camp in northern Kenya. The group continues to menace Kenya, which has sent troops into Somalia as part of an international peacekeeping effort.
The attack on Thursday night follows Al Shabab's brief takeover of a mosque in the area, which borders Somalia, the base for the militant group.
The strike follows a Christmas Day attack by the Islamic militant group on African Union forces in Mogadishu. It was the latest in a series of setbacks the group has faced in recent months.
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It's not yet clear whether the US air strike killed Al Shabab leader Ahmed Godane. He's blamed for encouraging the group to branch out into international terrorism.
Somali pirates in 2011 attacked 237 boats in the oceans around northeast Africa. In 2014 there have been seven attacks, all failed.