The face of terrorism has evolved from the coordinated, carefully plotted events of 9/11 to a helter-skelter approach where lone wolves use low-tech means to attack soft targets, according to one of the officials charged with keeping the traveling public safe.

“We face ambitious adversaries who are continuously looking for a point of attack and waiting for us to slip up,” Transportation Security Administration chief David Pekoske said in a “State of the TSA” presentation at George Washington University on Wednesday.

Adapting his agency to grapple with solo operators who may claim allegiance to a cause without having genuine connections to a terrorist group has been Pekoske’s focus since taking over as head of the TSA in August.

Read more: The Washington Post