Both leagues postponed tonight's games in response to unrest following Jacob Blake's shooting in Kenosha, Wisconsin, following postponements on Wednesday night.
The Texas English teacher has since been reinstated and is allowed to keep the posters in the virtual classroom.
The Los Angeles Lakers athlete is among the players who have called for action from team owners toward social-justice reform against systemic racism and police brutality.
Opposing sides met during an event outside Gresham City Hall where a Black Lives Matter flag is being flown.
The unrest came after a Black homicide suspect shot himself while being pursued by police.
"Federal authorities are committed to investigating this matter as thoroughly and efficiently as possible," the Department of Justice said in a news release confirming that a federal civil rights investigation had been launched.
"Last night shows the threat of these 'militias' is a clear and present danger to those who protest," said leaders from the National Urban League and its Wisconsin affiliates on Wednesday.
"They were armed. They were destroying property," Wisconsin state Representative David Bowen said.
"If there's somebody hurt, I'm running into harm's way. That's why I have my rifle, because I can protect myself, obviously," the 17-year-old says in a video.
The activist has previously wrongly accused two people on social media in connection to seperate rape and murder cases.
Julia Jackson said the violence and destruction taking place in Kenosha, Wisconsin after police shot her son is not what her family wants.
Democrats' identity politics obsession only fosters further disunity and stokes further discord for an already divided nation.
The 29-year-old is reported to be paralyzed from the waist down following the police shooting which has sparked mass protests and riots.
Kenosha County Sheriff David Beth said his office is investigating a group of men with guns who reportedly opened fire on protesters near a gas station.
Videos posted to social media show heated protests against police brutality and racial injustice sparked by the shooting of Jacob Blake continued for a third night in Kenosha, Wisconsin on Tuesday.
The Franklin County Republican Committee cut off support for a Republican prosecutor after he announced support for the Black Lives Matter movement and encouraged protesters to "demand that our national and local leaders authentically confront institutionalized racism."
Data from Mapping Police Violence reveals police in the U.S. have killed 751 people so far in 2020.
The teacher at El Camino Real Charter High School said she has been forced to move from her home because of the threats.
A video livestreamed by an activist on the protest march showed shots being fired outside a home in Cambria County, Pennsylvania.
The Wylie Independent School District previously apologized and pulled essay questions following the controversy.
There has been a second night of protests and clashes with police following the shooting of 29-year-old Black man Jacob Blake.
The city in Wisconsin has become the latest flashpoint for unrest after a video circulated online showing Kenosha Police shooting Blake, a Black man, in the back.
Local media reported that the standoff between Trump supporters and Black Lives Matter activists was peaceful.
Prominent civil rights attorney Ben Crump has been retained by the family of Jacob Blake, who is fighting for his life after being shot in the back by police in Kenosha, Wisconsin.
Blake, 29, is in hospital in a serious condition after being shot in the back by police in Kenosha, Wisconsin.
A debate around the sharing of such videos has been reignited following the shooting of Jacob Blake.
Prominent civil rights attorney Ben Crump said Blake's children "will be traumatized forever" after watching police shoot their father.