Sudanese journalists working for Reuters and Agence France-Presse, seized by the Sudanese authorities last week for covering protests about rising prices in Khartoum, Sudan’s capital, were freed on Monday, the news agencies reported.

The two journalists were among the last of 15 detained by Sudan’s National Intelligence and Security Service to be released.

Sudan’s government provided no explanation for why it had detained them or what charges, if any, they might have faced.

But press advocacy groups said many Sudanese journalists and newspapers had been warned not to report on the protests, which were seen as an embarrassment to the government of President Omar Hassan al-Bashir.