A worldwide terror alert prompted by the discovery of suspect packages on cargo planes may heighten concern over the crash of a UPS 747-400 plane in Dubai last month.

UPS is one of two carriers involved in Friday's bomb scare which followed the discovery of two supposed explosive devices, one in the UK and one in Dubai.

The suspect packages originated in Dubai prompting UPS and FedEx, the other cargo carrier involved, to suspend shipments from Yemen.

U.S. aviation authorities together with Dubai officials are already investigating the crash of a UPS Flight 6 from Dubai to Cologne in Germany which caught fire shortly after taking off from Dubai International Airport on September 3. The plane crashed soon after on Emirates Road, a major Dubai highway, killing the cargo plane's two crew members.

The Federal Aviation Administration says the crash is still under investigation and the cause has not been determined.

The authority did say however lithium batteries may have played a role in the crash.