Someone is stealing American made F-15/F-16 Pratt and Whitney jet engines from all over the world. Maybe the Chinese are trying to get ahead and get some design insight from these old engines to try to cut their reliance on the Russian Klimovs and since Shenyang WS-15 engine for their new fighter is reportedly running into development problems.
http://defensetech.org/2012/12/07/f-...2887570&rank=5