Sinmya Amera Ceasar, also known as Umm Nutella, was initially arrested in 2016 as she attempted to leave the country through JFK international airport to join ISIS.
The trio had begun making a suicide belt and were looking into making Acetone peroxide online.
Singapore detained two teenagers under internal security laws for extremist activities. One planned mosque attacks, while the other sought to join ISIS or marry an ISIS fighter.
After a decade of ISIS terrorism on the Yazidis in Iraq, a global network of activists, survivors, and volunteers continue their efforts to locate those still missing.
Another resident of his hometown had also pledged allegiance to the terror organization.
The group, of two 16-year-old and 17-year-old girls and a 16-year-old boy, were considering targeting a church, synagogue, or police station.
The assassination is certainly an important development and illustrates how important the US support for Iraq and the war on ISIS continues to be.
Khadijah was also considered the group's Chief of Global Operations in Iraq.
The Taiba resident, 21-year-old Kamal Nashaf, also pledged allegiance to ISIS, the agencies noted.
As long as terrorist groups exploit illicit trade networks, the risk of their expansion into North Africa and Europe remains dangerously high.