A Ferguson, Mo., police officer was shot Saturday evening, CNN reports, citing St. Louis County Police spokesman Brian Schellman.

The officer is alive. Police did not comment on the circumstances.

Demonstrators have taken to the streets of Ferguson since unarmed African-American teen Michael Brown was shot by white Ferguson police officer Darren Wilson on Aug. 9.

Despite demands by protesters, Wilson has not been charged in this case, though a grand jury is hearing evidence that could lead to an indictment.

Tensions reignited in the St. Louis suburb on Thursday night after a late-night appearance by Police Chief Thomas Jackson to address the crowd. A scuffle ensued, and arrests were made.