The Area North police station was on lock-down Monday morning, as protesters camped out in solidarity with their fellow activists, who were being held on misdemeanor reckless conduct and battery charges. They were slowly released from custody Monday.
One 20-year-old protester named Justin from Virginia, was released from custody and told FOX Chicago News that he wasn't protesting NATO specifically, because it's "pretty up there."
But he was upset that the Constitution doesn't seem to be upheld anymore regarding a citizen's right to assembly, and was at Sunday's protest to exercise that right.
Justin said he wasn't given a blanket or a mattress to sleep on in lock-up SUnday night, but the police who handled him at the station weren't so bad. He did say that the arresting officers were "brutal."
Moments after the Art Institute sit-in Sunday night, protesters marched from downtown Chicago to Belmont and Western.
Members of Occupy Chicago said that's where dozens of protesters were taken after they were arrested at the skirmish between protesters and police at Michigan and Cermak.
They also called it an opportunity to regroup and prepare for a larger demonstration that's planned outside Boeing's headquarters Monday morning.
Nearly 50 protesters camped outside the police station overnight. They told FOX Chicago News that they're waiting for the release of their fellow demonstrators.
"That march has since progressed here to jail solidarity where some of our brothers and sisters are being held who were arrested today," Occupy Chicago spokesman Micah Philbrook said. "That march is now here to help out, to be support to be out here when people come out here with water, smokes, food, things like that."
At least 45 protesters arrested on Sunday. A number of them were released earlier on Monday.
A police source told FOX Chicago News that as officers were gong through the arrested protesters' backpacks, they found Chinese stars, copper and steel wires, bottles, knives, urine and feces.
Police were concerned about their findings because protesters haven't used the items yet, and might choose to use them at the Boeing rally - or any other demonstration - on Monday.
Seven protesters were injured, as were four police officers.
A 20-year-old man from Romania said he joined the Occupy movement because he is a "Romanian soldier" ad doesn't tolerate NATO. He wanted to take part in the demonstration at Belmont and Western because he was proud of those who "sacrificed themselves" Sunday, and wanted to protect the "medics who were treating the injured."
The National Lawyers Guild is advising them regarding court dates.
Police had to process those with court business not related to the NATO protests outside Monday morning.
The permitted march itself was peaceful Sunday, except for a minor skirmish or two along the way - the rally at the end of the march was eventful.
But when the protesters were supposed to disburse and refused to do so the situation went from calm to confrontational. Chicago police in riot gear clashed with protesters who were determined not to back down.
The pushing and shoving quickly turned ugly with militant demonstrators hurling sticks, bottles buckets and more at officers. Police used billy clubs to beat back those who aggressively came at them.
At one point some protesters grabbed a metal barricade fence which police wrestled away so it could not be used as a weapon.
Police arrested a dozen or so people, the prime trouble makers, pulling them out of the crowd in a technique known as extraction, designed to avoid inciting the crowd by making mass arrests.
Police Supt. Garry McCarthy was calling the shots right behind his officers.
At one point the officers pulled out their gas masks and it appeared things might get dicey. But after trying them on the officers put them away.
After the standoff dragged on for more than an hour police gave protesters the warning that they needed to move west on Cermak or be arrested.
Police then began another push to move people out but a number of protesters got crushed up against a fence and injured.
After a few more clashes and arrests police had control of the street with only few dozen demonstrators remaining. At that point it was clear protesters had made their point and police theirs.
Supt. McCarthy shook hands with the troops seeming to signal "job well done."
Three Chicago police officers were injured in Sunday's incident, including one who was stabbed in the leg.