The mass deportations come amid rising tensions between Algeria and its southern neighbours, all now led by military juntas that ousted elected governments previously aligned with Algiers.Authorities in Algeria have rounded up more than 1,800 migrants and left them at the border with Niger in a record expulsion earlier this month, a migrant rights group has said. Alarmphone Sahara, which monitors migration across the region, said the migrants were bussed to a remote desert area known as "Point Zero" after being apprehended in Algerian cities. Abdou Aziz Chehou, the group’s national coordinator, said that 1,845 migrants without legal status...