Anti-austerity protests in Sudan have entered its sixth day amid reported crackdown on Sudanese and foreign journalists.
Riot police have fired tear gas and civilians armed with machetes and swords attacked protesters during demonstrations sweeping Khartoum to demand the resignation of Omar al-Bashir, the Sudanese president, a Sudanese opposition leader said on Thursday.
The protests are in response to austerity measures that will cut government jobs and raise fuel prices.
Saata Ahmed al-Haj, head of the opposition Sudanese Commission for Defense of Freedoms and Rights, said hundreds of protesters have been detained over the past five days.
He said they were later released but were badly mistreated.
Al-Haj said security forces shaved off the protesters' hair, stripped them naked, flogged them and then left them outside in the scorching sun for hours.
"I am under house arrest along with several opposition members, and security forces are encircling the place," he told The Associated Press over the phone.
"Our 'offence' is we are searching for freedom, and this is a crime in Sudan,'' he said.
"This is the outcome of political, economic and military suffocation felt by people here," al-Haj said.
Salama el-Wardani, an Egyptian journalist who works for the Bloomberg news agency, told the Egyptian daily al-Masry al-Youm that she was detained and interrogated for five hours along with a Sudanese activist, Maha al-Senousi.
The two were arrested while covering protests at Khartoum University on Thursday.
El-Wardani is now reportedly under house arrest awaiting notice if she will be deported. A reporter with the AFP news agency was also detained.
She uploaded this video of Sudanese police firing tear gas and warning shots in front of the Sudan Banking Academy.
The New York-based Committee to Protect Journalists urged authorities to stop harassment of journalists. Spokesman Rob Mahoney said in a statement that "journalists should be allowed to carry out their work freely without the threat of arrest".
Al-Bashir has said the austerity measures are necessary to pay for his country's conflict with South Sudan and to replace Sudan's oil revenues. He said Sudan no longer exports oil.
On Thursday, al-Bashir issued new decrees to cut expenditures as "part of the austerity plan", according to Sudan's official news agency SUNA.
The demonstrations started on Saturday night at the University of Khartoum. Students protesting transportation fare hikes took to the streets outside the downtown campus, where security forces fired tear gas and rounded up dozens of them.
Since then, Khartoum has been the scene of daily protests, spilling out to different of the capital.
Echoing calls heard in Arab Spring uprisings in Tunisia, Egypt, Libya and Syria, protesters chanted, "The people demand to bring down the regime."
Al-Bashir, 68, has ruled Sudan since 1989, when he carried out a bloodless military coup. Sudan was then in midst of two decades of civil war with the south, which declared independence last year and became the nation of South Sudan.
In the wake of another conflict, this one in the Darfur region in western Sudan, al-Bashir became the first sitting head of state indicted by the International Criminal Court for war crimes and crimes against humanity.