U.S. officials were reportedly frustrated by Kenyan security forces after clash with al-Shabab that killed 3 Americans

An attack on a U.S. military base in Kenya by al-Shabab fighters that killed three Americans earlier this month mostly flew under the radar amid rising tensions between the U.S. and Iran. But it's now raising questions about the effectiveness of the U.S. military's presence on the African continent, The New York Times reports.

There's still a lot that's unclear about al-Shabab's breach of the base, and the military's Africa Command has remained tight-lipped in the aftermath. Nobody is sure why the base — which is home to valuable surveillance aircraft — wasn't better protected, and there's also been some criticism of the Kenyan security forces who are being trained by the deployed U.S. troops.

At the Manda Bay base, the Kenyan forces are relied upon heavily to protect the airfield since there aren't enough American forces to stand perimeter security, a Defense Department official told the Times. But their performance during the skirmish with al-Shabab reportedly frustrated American officials. For example, the Kenyan forces announced they captured six of the attackers, all of whom were released after it turned out they were bystanders.

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Some have taken their speculation a bit further. One person briefed on an inquiry into the attack told the Times that investigators are looking into the possibility that the al-Shabab fighters received aid from Kenyan staff on the base, although one American official said the attackers likely made their move after patiently observing the routines of American soldiers. Read more at The New York Times.