“Sharifullah's capture and extradition is "a very notable development," said Lucas Webber, senior threat intelligence analyst at Tech Against Terrorism, an UN-backed project that monitors extremism online.
Webber said Sharifullah's capture is a "major event in the US fight against IS-K."
Webber said it could point to "signs of more coordination to come between the two countries."
"IS-K is highly multifaceted, expanding its operational cells and networks," said Webber. "It's a very dynamic, robust, internationally reaching organization and poses a serious threat."