Former presidential candidate Elizabeth Warren has subtly shown her support for the Black Lives Matter movement during her Democratic National Convention speech.
The former schoolteacher spoke about the need for reforms to the country's child care system as she gave an address on Wednesday from an early childhood education centre in Springfield Massachusetts.
Eagle-eyed viewers spotted a string of symbols which appeared to have been intentionally placed on display behind her, with the most prominent being three block letters spelling out B L M.
The blocks were placed in lockers behind the senator's left shoulder and were visible for the duration of her speech.
One of Ms Warren's former workers said the blocks had been placed there intentionally.
In the speech, Ms Warren, who has fought to pass legislation against racial injustice in the US on Capitol Hill, said: "We all need to be in the fight to get Joe and Kamala elected. And after November, we all need to stay in the fight to get big things done.
"We stay in the fight so that when our children and our grandchildren ask what we did during this dark chapter in our nation's history. We will be able to look them squarely in the eye and say, we organised, we persisted, we changed America."
In June, following the killing of African-American George Floyd, the senator introduced an amendment urging the Department of Defense to rename military bases after Confederate soldiers, specifically of those from all military assets, such as a base, installation, ship or aircraft, within three years.
Speaking to ABC News, Alencia Johnson, a former adviser on the Warren campaign, said she was unsurprised Ms Warren had a subtle BLM sign on show during her speech.
In a statement, Ms Johnson said: "What I experienced from working with her is she always finds a way to centre marginalized voices within her platform.
"She always nods to history and/or the present moment we're in."
Kristen Orthman, Ms Warren's former campaign communications director and current deputy chief of staff, said the idea to include the BLM sign was devised by Ms Warren and her senior advisor Roger Lau.
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She said: "They wanted to do a number of things in the background of the room and this was one they wanted to have visible in the camera shot."
In a Twitter thread, the senator's team shared more information about other signs in the classroom, including one which reminded people to vote on Election Day on November 3, and another emphasising efforts to save the USPS postal service.