Ambassador Sung Kim said Tuesday "perhaps some misinformation" was given to Duterte that made him express concern.
Duterte on Sunday identified three areas where U.S. forces were supposedly bringing in armaments, including the western Philippine province of Palawan, which faces the disputed South China Sea.
He said he would not allow the Americans to store weapons in local camps under the two countries' defense pact because the Philippines may get entangled if fighting erupts between China and the US.
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