Here's the official statement from the UAE General Civil Aviation Authority on the crash of a UPS plane near Dubai on 3 September. The investigation was heading towards the conclusion that there is --
focus of an international effort to gain a comprehensive understanding of the risks associated with specific hazardous cargo which under certain conditions could ignite and the resulting fire could self propagate. The Federal Aviation Administration (FAA) in the USA are working currently on a draft provision highlighting the risks associated with the carriage of lithium (or lithium derivative) batteries.
It doesn't take much dot-connecting to see a link between computer components being suspected in this crash and the new scare from packages sent from Yemen. Incidentally, a Lufthansa cargo plane was involved in an unexplained crash in Riyadh over the summer, but as it originated in Frankfurt, it is less clear how a dodgy package would have gotten on board.