In 2014, the Islamic State group could draw crowds of supporters, like these in Mosul, Iraq. But actual fighting recruits have been harder to come by. AP Photo

Al‑Qaida, Islamic State group struggle for recruits

A second plot was planned on 9/11, but there were too few terrorists to carry it off. Twenty years later, al-Qaida and its offshoot the Islamic State group still have trouble attracting recruits.

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