A group of uniformed officers in a street wearing a mixture of gas masks and face shields.
The police are controlling an unruly crowd.
A group of uniformed officers aren't always police. Just because they are wearing gas masks and face shields doesn't mean it's to control an unruly crowd.
Just because uniformed officers are wearing gas masks and face shields does not mean they are controlling an unruly crowd.  Uniformed officers may not be police.
Wearing gas masks and face shields does not mean it is for controlling an unruly crowd.