The unrest has since become a national phenomenon as protesters decry years of deaths at police hands.
Tense protests over the death of George Floyd and other police killings of black men grew Saturday from New York to Tulsa to Los Angeles, with police cars set ablaze and reports of injuries mounting on all sides.
As the night dragged on, fires erupted across the city's south side, including at a Japanese restaurant, a Wells Fargo bank and an Office Depot.
Military units would be deployed under the Insurrection Act of 1807, which was last used in 1992 during the riots in Los Angeles that followed the Rodney King trial.
Even as law enforcement nationwide harshly condemned Chauvin's actions in unprecedented language earlier in the week, they denounced the violence of the fiery protests and pleaded for calm.
The Guard was also on standby in the District of Columbia, where a crowd grew outside the White House and chanted curses at President Donald Trump.
Pentagon on Saturday ordered the Army to put military police units on alert.
Developments across the United States in connection with the death of George Floyd in Minneapolis police custody.
The Guard said a “key objective” was to make sure fire departments could respond to calls, and said in a follow-up tweet it was “here with the Minneapolis Fire Department” to assist.
Another protest was announced for Thursday evening near county offices downtown. Some stores in Minneapolis and the suburbs planned to close early, fearing more strife.