US believes terrorists testing bomb that may evade airport security

Al Qaeda and the Islamic State of Iraq and Syria, or ISIS, have been perfecting and testing a bomb small enough to fit in a laptop computer that could get past airport scanners, US intelligence officials said.
The concern about such an explosive hidden in a laptop or another large personal electronic device prompted the US and UK to go forward with a ban on most electronic devices in carry-on luggage on direct flights from eight countries in the Middle East and North Africa.