Four people whose names are on the federal government’s terror watchlist reportedly were recently arrested while trying to sneak into the United States from Mexico.

Customs and Border Protection briefed Congress on the intelligence matter Tuesday and said four matches to the FBI’s Terrorist Screening Database have been made since October, Axios reported. The briefing runs in line with statements from several House Republicans, who said during a border tour in Texas Monday that federal agents were encountering people attempting to enter the U.S. illegally.