At least 13 people were reported killed in Egypt on Sunday as anti-government protesters clashed with police on the anniversary of the uprising that ousted Hosni Mubarak.
At least 15 died as security officers fired on protesters in Cairo and other cities, witnesses told Reuters. Officials told the Associated Press at least 13 were killed and dozens more were injured.
The protesters were marking the fourth anniversary of the 2011 uprising, which ended the autocratic rule of Mubarak. The demonstrations were similar to protests that occurred on the anniversary last year.
Under the rule of President Abdel Fattah al-Sisi, the current president has largely cracked down on dissent and banned demonstrations without government approval.
Al-Sisi became the country's leader after Islamist President Mohamed Morsi was ousted following protests in 2013.
The government beefed up security around Cairo and elsewhere in the lead up to the anniversary, with over 130 people arrested, according to the AP.
Political activist Shaimaa el-Sabbagh was one of those killed by police in Cairo as she was marching to lay flowers to mark the anniversary.
The Socialist Popular Alliance party said Sabagh was killed by police birdshot while she was marching as part of a peaceful demonstration.
The government said it is investigating Sabagh's death, the AP reported.
Hundreds of people chanting pro-Democracy slogans attended el-Sabbagh's funeral on Sunday.
A representative from el-Sabbagh political party said Sunday that the Sisi regime is stifling the freedom of the Egyptian people.
"You can only deal with terrorism when you have free people, not slaves," Elhami el-Mirghani said at a news conference, according to the AP. "And this regime is the biggest creator of terrorism."
Amid the unrest, officials said on Monday that Mubarak's two sons were released from prison. They were arrested with their father nearly four years ago.
From the AP:
The two, along with their father, still face a retrial on corruption charges. Separately, the two sons also face trial on insider trading charges. They had been acquitted of other charges.