Ferguson, Missouri, has been racked by protests since an unarmed black teenager, Michael Brown was shot and killed by Ferguson police officer Darren Wilson last week. Over the weekend, despite calls for peaceful demonstrations by Brown's parents, several protests became violent. Protesters were not only angry about the shooting, but were outraged by the heavy police response to the demonstrations. The militarized tactics taken by Ferguson police were widely criticized, and officials are still struggling to control the situation. On Sunday U.S. Attorney General Eric Holder ordered a federal medical examiner to perform an autopsy, in addition to one being conducted by state medical examiners, and earlier today, Missouri's governor said he was calling in the National Guard to help restore order. Gathered here are photos of the chaos in Ferguson over the weekend. August 18, 2014
A law enforcement officer in a tactical vehicle watches after a device was fired to disperse a crowd on Sunday, August 17, 2014, during a protest for Michael Brown, who was killed by a police officer last Saturday in Ferguson, Missouri. As night fell Sunday in Ferguson, another peaceful protest quickly deteriorated after marchers pushed toward one end of a street. Police attempted to push them back by firing tear gas and shouting over a bullhorn that the protest was no longer peaceful. (AP Photo/Charlie Riedel)
Smoke trails tear gas canisters fired into the air after protests in reaction to the shooting of Michael Brown turned violent near Ferguson, Missouri on August 17, 2014. (Reuters/Lucas Jackson)
Police advance after tear gas was used to disperse a crowd during a protest in Ferguson, Missouri, on August 17, 2014. (AP Photo/Charlie Riedel)
Demonstrators hold up their hands as police fire tear gas at them as they protest the shooting death of Michael Brown on August 17, 2014 in Ferguson, Missouri. (Joe Raedle/Getty Images)
Tear gas rises from the ground after having been fired upon protesters in Ferguson on August 17, 2014. (Reuters/Lucas Jackson)
Police wait to advance after tear gas was used to disperse a crowd on August 17, 2014. (AP Photo/Charlie Riedel)
Demonstrators face off against the police as they are cleared from the street on August 17, 2014. (Joe Raedle/Getty Images)
A law enforcement officer watches as tear gas is fired to disperse a crowd protesting last week's shooting of teenager Michael Brown on August 17, 2014.
(AP Photo/Charlie Riedel) #
A law enforcement officer watches as tear gas is fired to disperse a crowd protesting last week's shooting of teenager Michael Brown on August 17, 2014. (AP Photo/Charlie Riedel)
A woman has her face doused with milk after being tear gassed by police during a protest on August 17, 2014. (Joshua Lott/Getty Images)
An FBI agent walks past a memorial erected where teenager Michael Brown was shot as the FBI interviewed residents of the neighborhood in Ferguson, Missouri, on August 16, 2014. (Reuters/Lucas Jackson)
Michael Brown Sr., the father of slain teenager Michael Brown, attends a rally at Greater Grace Church on August 17, 2014. His son was shot and killed by a Ferguson police officer on August 9, 2014. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Scott Olson/Getty Images)
A woman dances during church services at the Greater St Mark Family Church as the community discusses reactions to the shooting of teenager Michael Brown in Ferguson, on August 17, 2014. (Reuters/Lucas Jackson)
From left, Imani Harris, Cathryn Fraction, Zoi Williams (with hand at her face, bottom), Destiny Barnett and Zion Jamerison pose for a portrait with their signs during a protest of Michael Brown's murder on August 17, 2014 in Ferguson, Missouri. (Joshua Lott/Getty Images)
A man wearing a police hat protests in Ferguson on August 17, 2014. (AP Photo/Charlie Riedel)
Gabrielle Walker, 5, protests the killing of teenager Michael Brown on August 17, 2014 in Ferguson. (Scott Olson/Getty Images)
A woman looks into the camera during a demonstration to protest the shooting of Michael Brown and the resulting police response to protests in Ferguson on August 15, 2014. (Reuters/Lucas Jackson)
Police officers stand in position by the 911 Hair Salon as they watch demonstrators protest Michael Brown's murder on August 16, 2014. (Joshua Lott/AFP/Getty Images)
A protester kicks a tear gas canister back towards police after protests turned violent on August 17, 2014. Shots were fired and police shouted through bullhorns for protesters to disperse, witnesses said, as chaos erupted Sunday night in Ferguson, Missouri, which has been racked by protests since an unarmed black teenager was shot by police last week. (Reuters/Lucas Jackson)
Police officers react at the scene of a looting at the Dellwood Market after protests near Ferguson on August 17, 2014. (Reuters/Lucas Jackson)
People protest in Ferguson on August 17, 2014. (AP Photo/Charlie Riedel)
Police wait to advance after tear gas was used to disperse a crowd on August 17, 2014. (AP Photo/Charlie Riedel)
Masked individuals carry items out of a store, during on-going demonstrations against the shooting of Michael Brown, on August 16, 2014. (Reuters/Lucas Jackson)
Demonstrators attempt to stop masked individuals from entering a store that had been broken into, during demonstrations in Ferguson on August 16, 2014. (Reuters/Lucas Jackson)
Demonstrators protesting the killing of teenager Michael Brown by a Ferguson police officer try to stand their ground despite being overcome by tear gas on August 17, 2014. (Scott Olson/Getty Images)
Missouri State Highway Patrol Captain Ron Johnson holds a photo of Michael Brown while being interviewed during a peaceful demonstration, as communities react to Brown's shooting on August 14, 2014. (Reuters/Mario Anzuoni)
Highway Patrol Captain Ron Johnson speaks to protesters as he walks through a peaceful demonstration in Ferguson on August 14, 2014. (Reuters/Lucas Jackson)
Demonstrators raise their arms and chant, "Hands up, Don't Shoot", as police clear them from the street as they protest the shooting death of Michael Brown on August 17, 2014. (Joe Raedle/Getty Images)
People leave a McDonald's restaurant after taking refuge from tear gas after a protest in Ferguson on August 17, 2014. (AP Photo/Charlie Riedel)
Demonstrators protesting the shooting death of Michael Brown hold signs on August 16, 2014 in Ferguson, Missouri. (Joe Raedle/Getty Images)