Authorities have found suspicious packages on a plane in the UK, bound for Chicago.

Federal authorities were stepping up aviation security precautions after cargo planes were grounded at two U.S. airports in response to suspicious packages that may have been part of a “dry run” for a future Al Qaeda plot.

One of the packages, found on a UPS plane at East Midlands Airport in central England, contained what looked like a toner cartridge with white powder and wires coming out of it. Another package was found at a FedEx facility in Dubai.

The UK government is considering new fright restrictions on freight coming out of Yemen.

A documentary on Al Qaeda here.

A book on the roots of Al Qaeda here.