The four identified as Ayano Kabede Manamo, Mesfin Leimengo, Yonas Niguse Legbo and Mamush Gatuso Kidre were arrested at the Iringa Bus Terminal by immigration officers on patrol aboard a bus from Nairobi Kenya.
Confirming the incident, Iringa Regional Immigration Officer, Hope Kawawa, said the four who were travelling to Malawi will now be taken to court to face charges of illegally being in the country.
Kawawa said the immigration department was alert over reports that a number of illegal immigrants were finding their ways into the country using fake Tanzania names.
The department has expressed concerns over the increasing number of illegal immigrants in the country saying a crackdown has been launched to weed out all immigrants in the country.
The former Deputy Commissioner of Immigration Wilson Bambaganya, said between January and February 2016 alone, the department arrested about 4,792 foreigners who had no permits but were residing in the country, some of them. fleeing unrest in their countries.
In early 2016, immigration officials in the country launched a month-long series of raids to deport hundreds of foreign nationals found to have entered the country illegally, or working without permits.