The officials – reportedly from Tanzania Immigration authority are said to have searched the pair’s belongings and would not return their passports when asked.
Quintal and Mumo were then escorted from the hotel and have been taken to an unknown location. They were in the country on a reporting mission for CPJ, the body said in a statement.
“We are concerned for the safety of our colleagues Angela Quintal and Muthoki Mumo, who were detained while legally visiting Tanzania,” said Joel Simon, CPJ’s executive director. “We call on the authorities to immediately release them and return their passports,” he added.