ANKARA, Turkey (AP) — The U.S. Embassy in Turkey says six U.S. army post office personnel have been quarantined after handling a package containing a powdery substance at Istanbul's main airport.

U.S. Embassy Spokeswoman Deborah Guido says Friday the six were quarantined pending laboratory results to determine whether the powder is a dangerous substance, such as anthrax. The results are expected Saturday.

Guido said a health team has decontaminated the area and the six are being administered antibiotics as a precaution at a hospital in Istanbul.

The personnel deliver U.S. diplomatic mail in Turkey.