english: Officials began stepping up security as a group of some 1,800 migrants arrived a week ago just across the border in Piedras Negras, Mexico.
non_english: Pejabat wiwit nglindhungi keamanan minangka klompok saka 1.800 migran teka seminggu kepungkur ing seberang perbatasan ing Piedras Negras, Meksiko.