Mamadou Mouctar Diallo, a 20-year-old asylum seeker from Guinea and student at Brooklyn Frontiers High School, was detained by ICE on August 4, 2025, following a routine court appearance. He was transferred to a detention facility in Pennsylvania. Elected officials, immigrant advocates, and teachers rallied outside the Tweed Courthouse in Lower Manhattan in response to his detention. Diallo was held for approximately five months before being released in November 2025.