PITTSBURGH -- The G-20 Economic Summit concluded Friday in Pittsburgh, but a crowd of protesters continued to gather hours afterward in Oakland.

A crowd assembled near the University of Pittsburgh William Pitt Union and the Carnegie Museum. The rally in Schenley Plaza was held in response to how police used OC gas and rubber bullets to disperse a crowd of more than 1,000 in Oakland the night before.

Slideshow: Photos: Protests On Day 2 Of G-20

Channel 4's Jon Greiner reported that Friday night's rally had fewer participants, but encompassed a larger area as police chased those involved from one street to another.

Pittsburgh police reported 110 arrests, which prompted authorities to use Pennsylvania Department of Corrections buses to transport arrestees. There were no reported injuries, but two police officers were injured -- one for a dislocated shoulder and one for heat exhaustion, police said.

"Everyone was just sort of standing around spectating. No one was really having an adamant protest. It was just a bunch of college kids," said witness Ben Balik.

Police said there were eight warnings broadcast over the loud speaker in several languages to leave the area. Similar to Thursday night, police used OC gas, rubber bullets and broadcasted high-pitch noises in attempt to break up the crowd.

"Several disperse orders were given, at which time some of the people left, some of the people continued to stay -- mainly the anarchists, the anarchists that decided to be confrontational with police," Pittsburgh Police Chief Nate Harper said.

Police said some who came to Schenley Plaza were anarchists and some were local college students. Pitt police sent alerts to the campus community informing of the possibility of a planned disturbance. University police sent another alert shortly after 10 p.m., advising people to remain inside as conditions deteriorated outside.

"At 10:04, the crowds started getting bigger, and many of them were masked up and covered," University of Pittsburgh Police Chief Tim Delaney said. "I put a second (emergency notification system) message saying conditions may be deteriorating, students are advised to remain in the residence."

The arrests also included Pittsburgh Post-Gazette reporter Sadie Gurman. Luke Rudkowski said he's a freelance journalist from New York who was covering the protest when he got caught up in the confrontation.

"Police officers started hitting us with the baton sticks. They were literally coming screaming at us for no reason when we were just asking, 'Where can we leave? When can we go home?'" Rudkowski said.

Lee Iovino, who was working with Rudkowski, also spent the night behind bars.

"They pretty much took our stuff, tied us up. I was never read my rights. I was never even told what I was being arrested for," Iovino said.

Though both Rudkowski and Iovino were uninjured, others, like Jason Munley, of Shadyside, left jail Saturday morning with 10 welts on his back. He said he was shot repeatedly with balls of pepper spray.

Some who were arrested said police were too rough and attacked those gathered without cause. Harper disagreed.

"We do not take action until after we give at least several orders to disperse, which give them plenty of time to leave the area. If they decide to stay in the area, then we will arrest them for failure to disperse," he said.

"I felt like (I was) getting pelted with a bag or rocks or pebbles that are thrown at a high rate of speed," Munley said. "This is a destruction of our values and beliefs. Our founding forefathers fought for our right of freedom of assembly. We weren't even protesting. People were just hanging out having a gathering in the park."

Police said the event was far more than just a gathering in the park. WTAE Channel 4 Action News obtained the criminal complaints against all those arrested, which were almost identical. The papers indicate the protesters did not have a permit to gather in the park and they were all ordered several times to leave. They were given plenty of time and room to leave and refused, and, the complaints said, officers arrested everybody in the group when the protesters started throwing things at the police.

Greiner reported that it appeared protestors launched their own gas at police.

Some involved thought their message was lost in all the commotion.

"To meet that sort of resistance, I don't even know how to describe it, it's defeating, it's angering. We're not getting heard and we're losing our message with so many groups and everybody doing things on their own," said one protester.

Nearly all of the people who were arrested over the last couple of days have court dates scheduled for next week. It's not expected any of them will actually serve any jail time.

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What Is The G-20?

G-20 -- the Group of 20 Finance Ministers and Central Bank Governors -- was established in 1999 "to bring together systemically important industrialized and developing economies to discuss key issues in the global economy," according to its Web site, G20.org.

Countries from all over the world -- including the U.S., Canada, China, France, Germany, India, South Korea, Saudi Arabia and Russia -- are involved in the G-20 summit.

The gathering typically attracts a variety of protestors from around the world. In April, London saw mostly peaceful protests about economic policy, the banking system and bankers' bonuses, climate change concerns and the war on terror.

Photo Slideshow: World Leaders, Protests At G-20 Summit

During the last G-20, a peaceful protest dubbed "Financial Fools' Day" was held April 1 by the Pittsburgh Organizing Group, a local anarchist group. Members and supporters gathered in Market Square before marching around downtown, stopping at several banks and government offices.

More Info: What Is G-20?

Official Web Site: PittsburghG20.org