WASHINGTON (AP) – U.S. officials suspect that Pakistan allowed the Chinese military to see  secret new U.S. technology – the U.S. helicopter that crashed in the raid that killed Osama bin Laden.

Two senior defense officials said Monday that it is not certain, but that officials suspect Pakistan let the Chinese military see the aircraft. The officials spoke on condition of anonymity to discuss intelligence.

The international business newspaper Financial Times quoted unnamed U.S. officials saying Chinese engineers photographed and took samples of the wreckage from the stealth helicopter that crashed at bin Laden’s compound in the May raid.

The wreckage has since been returned to the U.S.