The authorities in Saudi Arabia have arrested two human rights activists so far this year, Human Rights Watch and Amnesty International say.
Essam Koshak and Ahmed al-Musheikhis were summoned for questioning by police in Mecca and Qatif last week.
Officials have not disclosed the reasons for the detentions. But HRW said they «fit a pattern of ongoing repression» against peaceful advocates and dissidents, at least 25 of whom have been convicted since 2011.
Many have been handed sentences as long as 10 or 15 years after being found guilty of charges including «breaking allegiance with the ruler», «sowing discord», «inciting public opinion», «setting up an unlicensed organisation», and violating the cybercrime law.
Mr Koshak was detained after being summoned for interrogation by the Criminal Investigation Department (CID) in Mecca on 8 January. The 45-year-old was not allowed to appoint a lawyer and was being questioned about his Twitter account, which he mainly used to tweet about human rights issues, according to Amnesty.