Opposition protesters in Egypt have stormed and set fire to the Cairo headquarters of the Muslim Brotherhood.
The protesters threw files from the windows and looted furnishings on July 1.
The attack comes a day after 16 people were killed in nationwide protests against the government.
The June 30 protests saw millions of opposition protesters take to the streets of Cairo and cities around the country in a massive display of anger and frustration with President Muhammad Morsi, a leading member of the Muslim Brotherhood political movement.
Critics accuse Morsi of giving too much power to Islamists and failing to tackle economic problems.
Morsi's official spokesman, Omar Amer, said the president had admitted mistakes and was in the process of fixing them.
He repeated Morsi's offer of dialogue but made clear he had no intention of resigning.
The protests were the largest seen in Egypt in the 2 1/2 years of turmoil since the ouster of autocratic President Hosni Mubarak in February 2011.
The opposition National Salvation Front coalition of liberal, secular, and left-wing parties declared victory, saying the masses had "confirmed the downfall of the regime of Muhammad Morsi and the Muslim Brotherhood."
Based on reporting by AP, AFP, and Reuters