At least three people were killed and 174 injured during clashes in Egypt on Sunday, officials said, exactly one year after the country's first democratically elected president came to power.
Protesters took the streets, demanding the resignation of President Mohamed Morsy. His supporters also rallied at what were mostly peaceful demonstrations.
However, at least one person was killed in Bani Suef, south of Cairo, when fighting broke out between the two sides, said Health Ministry spokesman Yehya Moussa. Two others were killed in Asuit, he said. All three suffered gunshot wounds.
Many Egyptians worried about tensions leading to a dramatic showdown.
"Egypt is on the brink of a volcano," government-run newspaper Al-Akhbar said.
Anti-Morsy supporters divided
Anti-Morsy protesters have a wide range of views on why Morsy should go and how to eject him from office.
The Tamarod, or "rebel," campaign, a large movement led by opponents of the president, has spent months collecting signatures on a petition calling for Morsy to step down and call new elections. Organizers helped push for Sunday's protest.
But the opposition is made up of various groups and loose coalitions, and not all anti-Morsy protesters agree with the road map the Tamarod campaign is advocating.
Some anti-Morsy protesters are loyal to the ousted government of Hosni Mubarak, while others want the army to intervene and lead a transition similar to the revolt that removed Mubarak from power.
Applause greeted Egyptian military helicopters that flew over Cairo's iconic Tahrir Square midday on Sunday during protests.
Morsy's opponents stood their ground in the square, where protests two years ago helped topple Mubarak's 29-year rule. This time, they're hoping for the same fate for Morsy, as the chant most heard in the crowd was the word "leave."
Ordinary citizens fed up with fuel shortages, power cuts, a collapsing economy and rising crime have also joined the protests.
Morsy supporters rally
Morsy's supporters, however, say the president needs more time to tackle Egypt's problems. Supporters gathered at the presidential palace in Tahrir Square and in Rabaa Al-Adawiya Square in Cairo's eastern suburb of Nasr City on Sunday.
A sit-in that started on Friday continued in Rabaa Al-Adawiya Square, where thousands of supporters gathered in support of Morsy.
Demonstrator Rifaat Ali traveled from Upper Egypt to the capital with a message to Morsy's opponents: "Our patience has run out. Either you back off, or the only thing left to do is attack with one fist."
The tensions weren't limited to Cairo. Protests also erupted Sunday in Suez, Sharqia, El Monofia and Gharbiya, the state-run Ahram news agency said. And in the port city of Alexandria, so many people turned out that traffic virtually came to a standstill.
Fears of more violence
Before the death reported Sunday, clashes had already claimed at least eight lives, including associates of the Muslim Brotherhood whose offices came under attack.
Andrew Pochter, a 21-year-old American in Alexandria to teach children English, was stabbed to death Friday while watching the demonstrations, his family said.
The Kenyon College student wanted to improve his Arabic before returning to the United States.
"He cared profoundly about the Middle East," his family said. Pochter was planning a career in the region in hopes of advancing the peace process.
An Egyptian man died from a gunshot wound to the head, the health ministry said.
Muslim Brotherhood under fire