How would they know that?
Via Newsmax:
The United States told the U.N. Security Council early Wednesday that the suspected ringleader of a deadly 2012 attack on its diplomatic compound in Benghazi was planning more terrorist attacks specifically targeting Americans.
That alone justified his capture, U.S. authorities said.
In a letter obtained by Reuters early Wednesday, U.S. Ambassador to the United Nations, Samantha Power, notified the council of the capture on Sunday of Ahmed Abu Khatallah by U.S. special forces in Libya after an investigation identified him as a key figure in the 2012 attack that killed four Americans.