Using tragedy to cause trouble after dark.
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Missouri Gov. Jay Nixon declared a state of emergency and a curfew in Ferguson, Mo., following a second night of looting and violence.

Saturday’s conference erupted into chaos as residents continually interrupted both Nixon and Johnson.

Nixon said that though demonstrators protesting the fatal police shooting death of Michael Brown were peaceful and constructive, others continued looting.

“But we also saw a pattern develop last night where after hours of peaceful protesting, small groups took to the streets with the intent of committing crimes and endangering citizens,” Nixon said.