CPJ said that Quintal, a former editor of South Africa's Mail & Guardian newspaper, and Mumo were legally in Tanzania "on a reporting mission" when they were detained. For now, Quintal and Mumo are well and will stay at their hotel, Mabaya said.
"If they want to engage themselves in anything more than a normal visit then they have to request appropriate permits", spokesperson for Tanzania's immigration ministry Ally Mtanda is quoted to have said.
The South African National Editors' Forum (Sanef) on Thursday called on the global relations department to ensure local journalist Angela Quintal and her colleague Muthoki Mumo's passports were returned immediately.
"We believe that the detention of journalists is a direct and unsafe threat to media freedom and access to information".
Quintal sent a message Wednesday from her verified Twitter account saying she and her colleague were "being taken for interrogation by Tanzanian authorities and we don't know why?"
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Giving details on their arrest‚ Gallens said: "After approximately five hours‚ Quintal and Mumo were then returned to their Dar es Salaam hotel at around 3am - but without their passports".
Reporters Without Borders, a pressure group, ranked Tanzania 93rd out of 180 countries worldwide in its 2018 World Press Freedom Index, down 10 places from the previous year.
CPJ's executive director Joel Simon has called for their immediate release. They were released on Thursday morning but are yet to get their passports back.
Press freedom has come under attack in Tanzania under the administration of President John Magufuli. "One paper made a decision to suspend publication itself after publishing a story it feared might irritate officials.There have also been more violent incidences of harassment".