The attacks follow about a five-year respite for the region, where piracy had grown to crisis proportions during the 2010-2012 period, drawing the navies of the United States and other nations into a lengthy campaign against the pirates.
U.S. Defense Secretary Jim Mattis told reporters at a military base in the African nation of Djibouti, near the Gulf of Aden, that even if the piracy problem persists, he would not expect it to require significant involvement by the U.S. military.
At a news conference with Mattis, the commander of U.S. Africa Command said there have been about six pirate attacks on vulnerable commercial ships in the past several weeks.
"We're not ready to say there's a trend there yet," Marine Gen. Thomas Waldhauser said, adding that he views the spurt of attacks as a response to the effects of drought and famine on the Horn of Africa.
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