According to eyewitness Renee E. Walker, who took the photos above:
There was a fox spotted [at] 63rd and Jackson around 7:37 AM. Two cars stopped the fox was wandering around in circles and was acting strange. Our brave Fridley police handled the situation quickly. Thank you Fridley Police Department
It was walking in my front yard, and the kids that walk to school were walking around it, cars drove around it and it was not [fazed].
Walker added that police said it was a grey-tailed fox.
Update (4:30 p.m. Thursday): Lt. Mike Monsrud of the Fridley Police Department said this is what happened:
Our officers did capture a very sick fox here this morning about 7:30. The fox was very sick. They took the fox up to the city garage where they put it down and disposed of it.
We don't normally test those for rabies if they hadn't bitten anybody or anything like that, so we did not test this for rabies, but [it] more than likely based on how it was acting.