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.