Seems odd that there is no link between the two.
Check it out:

Authorities searched Sunday for two men suspected of shooting and wounding a police officer in Ferguson, Missouri, the St. Louis suburb where there have been angry protests since a white officer fatally shot an unarmed 18-year-old black man last month.

Although there were two separate protests about the Aug. 9 shooting of Michael Brown happening around the time the officer was shot Saturday night, St. Louis County Police Chief Jon Belmar said he didn’t think they were related in any way to the attack on the officer.