House Republicans asked two top Biden administration officials on Tuesday to provide more information about the three suspected Palestinian terrorists who were apprehended crossing the US-Mexico border illegally last month.

The letter, addressed to Homeland Security Secretary Alejandro Mayorkas and FBI Director Christopher Wray, comes after Border Patrol agents detained the Palestinian nationals and one migrant from Turkey also suspected of having ties to terror groups along the San Diego sector of the border. The incident is being investigated by the FBI’s Joint Terrorism Task Force.

“These recent arrests highlight a systemic pattern in the rise of known or suspected terrorists attempting to, and successfully, crossing the Southwest border,” House Homeland Security Chairman Mark Green (R-Tenn.) and Reps. Clay Higgins (R-La.), Dan Bishop (R-NC) and August Pfluger (R-Texas) wrote in their missive. The lawmakers note that they have not been told “whether these individuals have ties to Hamas, Hizballah (sic), or another US-designated foreign terrorist organization” and demand that Wray and Mayorkas provide Congress with the “complete Alien Files” of the four individuals as well as information potentially linking them terror groups and Immigration and Customs Enforcement officer and prosecutor notes relating to the foreign nationals. They ask that the Biden administration officials comply with their request by Aug. 27.