A woman was killed and five others were injured on Saturday in a shooting at a park in Portland, Oregon, police said.

The recent fights between far right groups and counter protesters in Portland are part of a build-up on extremist presence in the state, experts said.

Members of a specialized Portland police unit that deals with crowd control have resigned en masse a day after a fellow officer was indicted on an assault charge.

Mayor Ted Wheeler called for the city to “unmask” and “arrest” Antifa members. Two members of Antifa anonymously tell “Nightline” that “most of us are in this work to make our communities safe.”

The DHS inspector general has put out a report saying DHS had the legal authority to deploy agents and officers to Portland last summer but no comprehensive strategy.

One person is in critical condition and the suspect was arrested.

Police are still looking for the suspect who lit city hall on fire.

Portland, Oregon, and Oakland, California, have sued the Departments of Homeland Security and Justice for their involvement in summer protests.

A demonstration in Portland, Oregon, that broke windows took down statues of former Presidents Theodore Roosevelt and Abraham Lincoln has been declared a riot by police.

The Justice Department has singled out three cities for potential cuts to federal funding over what it describes as their leaders "permitting violence."

The Justice Department says it researched the possibility of charging city officials in Portland related to their response to violent unrest there this summer.

Personal disputes and looting linked to some of the deaths.

Jacob Blake spoke out from his hospital bed as anger emerged in the streets of both Portland and Kenosha over the weekend.

The 100th consecutive night of protests in Portland quickly escalated into a riot Saturday as people hurled homemade "fire bombs" at officers, police said.

Protesters clashed with police and gasoline bombs were thrown at some officers on the 100th consecutive night of protests in Portland.

Newly unsealed court documents help provide a timeline of the fatal shooting of a pro-Trump protester in Portland late last month.

No officers were injured during the incident.

ABC News Correspondent Kayna Whitworth reflects on her experience covering the ongoing protests in Portland, Oregon.

Video shows Portland cops punching protester as Gov. Kate Brown debuts plan to end violence; the violence erupted following the fatal shooting of a Trump supporter.

Violence erupts in Portland as BLM and counterprotest groups clash in cities nationwide.

Portland Mayor Ted Wheeler blasted President Donald Trump after a weekend of violent clashes.

A day after a deadly shooting in downtown Portland, President Donald Trump and Mayor Ted Wheeler were in a war of words, after Trump called the mayor "a fool."

One person was pronounced dead on scene after gunshots rang out during protests.

A three-judge panel on Thursday temporarily halted protections for journalists and legal observers covering the unrest In Portland, Oregon.