The officials searched the pair's belongings and confiscated their passports.
Two Committee to Protect Journalists staffers have been released from detention in Tanzania and have left the country, the organization announced Thursday.
"It is now abundantly clear to anyone who followed the latest developments that Tanzanian journalists work in a climate of fear of intimidation, " he said.
In the meantime, the Department of International Relations and Cooperation is trying to establish what has happened. "It is deeply ironic that through their unjustified and abusive detention of our colleagues, Tanzanian authorities have made their work that much easier".
Tanzania released two staff members of the New York-based Committee to Protect Journalists (CPJ) on Thursday, a day after they were detained, and their passports seized, the South African Foreign Ministry said.
CPJ Executive Director Joel Simon expressed appreciation to journalists, media, press freedom organisations and government officials who spoke out about Quintal and Mumo's detention.
A few hours earlier, Quintal sent out an SOS on both Facebook and Twitter saying she and Mumo were being taken to an unknown location for interrogation. Simon noted in particular the assistance of the South African and Kenyan governments.
He added that both women were now at the South African embassy in Tanzania's economic capital Dar-es-Salaam.
"Officers who identified themselves as working with the Tanzanian immigration authority detained Quintal and Mumo in their hotel room in Dar-es-Salaam", CPJ said in a statement. For now, Quintal and Mumo are well and will stay at their hotel, Mabaya said.
The two officials of worldwide press rights group, Committee to protect Journalists, CPJ; have been freed by Tanzania's immigration authorities.
Since his election three years ago, Tanzania's President John Magufuli has cracked down on independent media, closing down critical newspapers, while rights groups have protested against the imposition of restrictive laws on freedom of expression.
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