A federal judge in Oregon has issued restrictions on federal officers' use of tear gas and chemical munitions at protests outside the U.S. Immigration and Customs Enforcement building in Portland.

The ruling limits when federal agents can deploy chemical crowd control measures at demonstrations targeting the ICE facility. According to court documents, the restrictions specify that such munitions can only be used when there is an imminent threat present.

The decision comes amid ongoing tensions between protesters and federal law enforcement at the Portland ICE building, which has been a frequent site of demonstrations. The facility has drawn regular protests from immigration activists and other groups opposed to federal immigration enforcement policies.

The court order represents a judicial intervention in the tactics used by federal officers during civil unrest situations. The ruling establishes specific criteria that must be met before chemical crowd control agents can be deployed against demonstrators.

Portland has experienced numerous protests in recent years, with federal buildings including the ICE facility becoming focal points for various activist movements. The new restrictions will govern how federal law enforcement responds to future demonstrations at the immigration enforcement facility.