"We need this guy to get out," said protester Ahmed Mansour. "Gadhafi, you are ruling over Libya, it's now your 42nd year. This type of issues is over in the whole world, there are no more dictatorships again in the whole world. We people are supporting each other and we need all dictators to get out of the whole world, not just Libya."
In Benghazi, the bodies of security forces were hung from flag poles after protesters took over a government building.
In some cities, there are reports military units are siding with protesters. The country's state-operated TV news channel was also ransacked.
Earlier today, witnesses reported a massacre with hundreds dead as the military opened fire on anti-government demonstrators, attending a funeral for protesters killed the day before.
"They're firing on civilians here. They're crazy. They're going crazy here," a doctor told the BBC.
Seif al-Islam said that the army has made mistakes during protests because it was not trained to deal with the demonstrations.
"If it comes to civil war, 5 million people will fight and 100,000 will die. It will be a bloodbath," he warned.
The unrest prompted British Petroleum officials to prepare the "likely" evacuation of its staff the Associated Press reported.
BP spokesman David Nicholas said the company has about 140 employees in the country.
EU foreign ministers condemned Libya's crackdown on the protesters and are also preparing to transport their citizens out the country.
"We are very worried about the situation in Libya," Spain's Foreign Minister Trinidad Jimenez told the Associated Press. "At the same time we are coordinating the possible evacuation of EU citizens from Libya, especially from Benghazi."
Since Mubarak resigned, protests have spread across the Middle East though unlike in Egypt, they have taken on a brutally violent shape.
Reports of protests were seen in Morocco and Yemen, both U.S. allies, and Algeria.
In Bahrain, after nearly a week of anti-government protests that have killed numerous people, the streets were calmer but protesters gathered at Pearl Square maintained their momentum.
Negotiations have still not commenced between the crown prince and main opposition groups, who are calling for huge protests Tuesday. Protesters have been busy organizing themselves, setting up a media center, kitchens, first aid station, even garbage collection in Pearl Square.
Outside the Middle East, Iran has also been ransacked by protests in recent days. Eyewitness reports from Tehran describe large protests met with gunfire from security forces. Guards were seen shooting at people who, in turn, threw stones back at security officers.
ABC News' Katie Slaman, Lama Hasan, Jim Sciutto, Luis Martinez, Ann Compton, Lara Setrakian and the Associated Press contributed to this report.