(Adds statement by U.S. Forces-Afghanistan in paragraphs 3-4)

WASHINGTON, July 2 (Reuters) - A U.S. soldier is believed to have been captured by insurgents in eastern Afghanistan's border region, a U.S. military official said on Thursday.

"A soldier who has been missing since June 30 is now believed to have been captured by insurgent forces," the official said.

A statement by U.S. Forces-Afghanistan, the headquarters of American troops operating in the country, said further details were being withheld to protect the soldier.

"We are exhausting all available resources to ascertain his whereabouts and provide for his safe return," the statement said. (Reporting by David Morgan; Editing by Bill Trott)

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