Nairobi - The armed US Marine stood behind sandbags atop the US Embassy in Nairobi and looked through binoculars.
What he saw was a busy street lined by a few diplomatic missions that officials fear could be targeted by Islamic militants.
Fifteen years after al-Qaeda destroyed the US Embassy in Nairobi with a truck bomb that killed more than 200 people, fear is rising that the US could again be targeted.
Intelligence has been circulating recently that American interests are the next intended target for al-Shabaab, an al-Qaeda linked group in Somali, said a Kenyan police official who insisted on anonymity to talk about security matters.
US Ambassador Robert Godec last week told a town hall meeting: "We know that there's a threat, and we know it's serious."