Qatar Airways has confirmed that a bomb discovered in Dubai was carried by two of its passenger planes through Doha. <br /><br />The head of the airline has told Al Jazeera it is doing its best, but there simply isn't much more that can be done, to detect such bombs.<br /><br />The bomb that was found in a Fedex parcel in Dubai came from Yemen. Another bomb ended up at East Midlands airport in the UK, on a UPS plane. The final destination of both bombs was Chicago in the US. <br /><br />Al Jazeera's Dan Nolan reports from Dubai.