(Bloomberg) – The threat to U.S. airports from terror groups such as al-Qaeda and Islamic State is expected to grow because of instability in parts of the Middle East and Asia, a former high-ranking intelligence official said Thursday.

The focus on fighting Islamic State, also known as ISIS, has allowed al-Qaeda and its offshoots to "rebound" in countries including Yemen, Pakistan and Afghanistan, said Michael Morell, former deputy director of the Central Intelligence Agency.

At the same time, as Islamic State loses territory in Syria and Iraq, the tens of thousands of its fighters who poured in from other countries will leave, and some will try to infiltrate the U.S., Morell said.

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