Saba Azarpeik, an Iranian journalist working for several reformist publications, has been arrested in Tehran.
Reports say Azarpeik was taken away by security forces earlier on May 28 from the offices of the reformist "Tejarat-e Farda" weekly in the Iranian capital.
The reason for her arrest is not clear.
The outspoken Azarpeik was also arrested in January 2013 in a crackdown on several newspapers in which several reporters were arrested.
Dozens of journalists and bloggers remain behind bars in the Islamic republic, often described by media groups as one of the worst jailer of journalists in the Middle East.
On May 10, journalist Seraj Mirdamadi, who had returned to Iran in the wake of the election of President Hassan Rohani, was arrested.