The lightning speed success of the Islamic State of Iraq and Syria (ISIS) and reports that ISIS has developed new technology for creating air passenger bombs has led U.S. Transportation Security Agency to tighten up measures for international flights leaving the United States.

Passengers taking international flights into the United States now must have their cell phones and other electronic devices pass additional inspection before boarding planes, as part of the Transportation Security Administration’s most recent strategy to protect against the threat of a new type of terror attack.

The TSA said Sunday it is requiring only some overseas airports to conduct the additional inspections. The agency also said devices that fail to power up won’t be allowed on planes and that their owners might have to undergo extra screening before boarding.

“As the traveling public knows, all electronic devices are (already) screened by security officers,” the agency said in a release.

ABC News reports that recent intelligence suggests Al Qaeda-linked terrorists in Syria (ISIS) are working with members of Al Qaeda in the Arabian Peninsula to blow up a commercial aircraft headed to the U.S. or Europe.

Americans and others from the West have traveled to Syria over the past year to join Al Nusra Front’s fight against the Syrian government.

One fear is fighters with a U.S. or Western passport — and therefore subject to less stringent security screening — could carry such a bomb onto an American plane.

Al Qaeda in the Arabian Peninsula has long been fixated on bringing down airplanes with hidden explosives. It was behind failed and thwarted plots involving suicide bombers with explosives designed to hide inside underwear and explosives hidden inside printer cartridges shipped on cargo planes.