A day after conservative activist Laura Loomer posted videos on social media of children from Gaza arriving in the U.S. for medical treatment and questioning how they got visas, the State Department said it was halting all visitor visas for people from Gaza pending a review.

Secretary of State Marco Rubio said Sunday that the State Department suspended visitor visas for Gazans because it received “evidence” that some organizations facilitating the visas to the US “have strong links to terrorist groups like Hamas,

The move comes after far-right activist Laura Loomer drew attention to a video posted by the nonprofit HEAL Palestine and called the visas a “national security threat.”