Saudi Arabia has arrested two more women’s rights activists, the latest to be swept up in a government crackdown on activists, clerics and journalists, an international rights group said on Wednesday.

Human Rights Watch (HRW) said authorities arrested Samar Badawi and Nassima al-Sadah in the past two days.

More than a dozen women’s rights activists have been targeted since May. Most campaigned for the right to drive and an end to the kingdom’s male guardianship system, which requires women to obtain the consent of a male relative for major decisions.

The arrests are at odds with the progressive image the government has projected this year under Crown Prince Mohammed bin Salman.

Government spokesmen did not immediately respond to a request for comment on the latest reports.

Badawi has received the United States’ International Women of Courage Award in 2012 for challenging the guardianship system, and was among the first women who signed a petition calling on the government to allow women to drive, vote and run in local elections.

Sadah, from the restive Shia-majority Qatif province, has also campaigned to abolish the guardianship system and the right to drive.

“The arrests of Samar Badawi and Nassima al-Sadah signal that the Saudi authorities see any peaceful dissent, whether past or present, as a threat to their autocratic rule,” said Sarah Leah Whitson, Middle East director at Human Rights Watch, in a statement.

“Saudi authorities have targeted and harassed Badawi for years. In addition to her advocacy for women’s equality, she has campaigned energetically for both her former husband and her brother to be released from prison,” the statement added.

Badawi’s former husband is already in prison, serving a 15-year sentence for human rights activism, and her brother Raif Badawi, a prominent blogger, is serving a 10-year sentence for expressing controversial opinions online.

Saudi authorities have barred her from traveling abroad since 2014. Prince Mohammed has courted Western allies to support his economic reform plan, offering billions of dollars of arms sales and promising to fight radicalism in the kingdom. Hundreds of billions of dollars of investments were discussed during his trips to the United States and Europe.

In May, authorities arrested 10 women’s rights activists, including Eman al-Nafjan, Loujain al-Hathloul, Aziza al-Yousef, Aisha al-Manea, Ibrahim Modeimigh and Mohammed al-Rabea.

Officials said seven people had been arrested for suspicious contacts with foreign entities and offering financial support to “enemies overseas”, and that further arrests could be carried out as the investigation proceeded.

In June, the government ended a decades-old ban on women driving cars as part of a bid to diversify the economy away from oil and open up Saudis’ cloistered lifestyles.