Authorities are trying to determine what caused an 8-year-old refugee from Congo to die not long after his arrival in Chicago.

WBBM-AM reports (http://cbsloc.al/2cUO257 ) that the boy, identified as David Dieme, arrived at O'Hare International Airport from Dubai on Tuesday with his father and several other children. The group was planning to fly on to Texas when a U.S. Customs and Border Protection officer noticed that David was unresponsive.

Authorities say the boy was sick before boarding the flight to the U.S. but that he reported no symptoms on the plane. He was examined by Centers of Disease Control and Prevention personnel before being taken to a hospital, where he was pronounced dead.

The Cook County medical examiner's office performed an autopsy Wednesday. Results are pending.

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Information from: WBBM-AM, http://www.wbbm780.com