Explosive devices were discovered in both Dubai airport, on a cargo plane bound for the US, and a cargo plane in the UK, also US-bound.
The bombs, which bore the professional characteristics of terror groups such as Al Qaeda, were both discovered on planes which had set off from Yemen, and were destined for Chicago.
A female medical student from Yemen has been arrested having been traced through the cargo company, while her mother was also being detained — though it is said she is not a prime suspect.
The explosive packages were addressed to synagogues in Chicago.
The suspected Al Qaeda parcel intercepted in Dubai was flown in on a Qatar Airways flight from Sana’a via Doha.
US President Barack Obama said the parcels, which were discovered after a tip-off from Saudi Arabia, were a ‘credible terrorist threat’.