Disaster relief efforts are under way in the Midwest; 31 people have died.
Twelve of at least 13 flood-related deaths were caused by vehicles being swept from flooded roadways.
Mayor James Knowles said the officer who shot Michael Brown remains on leave pending an internal investigation. Meanwhile, he criticized Mo. gov. Jay Nixon for his delayed response to unrest in Ferguson.
The withdrawal follows the most peaceful night of protests in Ferguson since the shooting of Michael Brown nearly two weeks ago
The US National Guard tries to restore order in Ferguson, Missouri after a second night of unrest
Gov. Jay Nixon declared a state of the emergency after a week of protests surrounding the fatal shooting of Michael Brown