The United Arab Emirates ruled out that an explosive device was aboard a Boeing 747-400 plane operated by U.S. parcel delivery firm UPS that crashed in Dubai in September.

Two air freight packages containing bombs -- both sent from Yemen and addressed to synagogues in Chicago -- were intercepted in Britain and Dubai last week.

"The General Civil Aviation Authority (GCAA) investigation team ... has concluded that there was no presence of acoustic evidence or any forensic signature supporting the detonation of an explosive device," the GCAA said in statement on its website.

Two crew members died when the cargo plane, which was en route to Cologne, Germany, crashed in a military compound near Dubai's airport on Sept. 3 after the pilot reported fire and smoke in the cockpit.

The GCAA said its investigation into the crash was continuing. (Reuters)