Muriel Bowser

The provided news articles do not mention Muriel Bowser. Therefore, it is impossible to provide a summary about her based on the given information. The articles discuss a shooting of a US park police officer in Washington D.C., and a federal emergency declaration approved by Donald Trump related to a sewage spill in the Potomac River. These events are significant because they involve public safety concerns, potential environmental hazards, and federal disaster relief efforts. However, without any mention of Muriel Bowser in the articles, her role or relevance to these events cannot be determined.