Civil rights leaders have criticised Mark Zuckerberg’s decision to take no action against a Facebook post from Donald Trump appearing to threaten to start shooting “looters”, after a Monday night meeting with the company’s executives ended in acrimony.

“We are disappointed and stunned by Mark’s incomprehensible explanations for allowing the Trump posts to remain up,” Vanita Gupta, Sherrilyn Ifill and Rashad Robison said in a statement.

The three activist leaders – the heads of the Leadership Conference on Civil and Human Rights, the NAACP Legal Defense and Educational Fund, and Color of Change – met Zuckerberg, the CEO of Facebook, and its chief operating officer, Sheryl Sandberg, on Monday night.

They discussed Trump’s Thursday night post, which urged the military to intervene in Minneapolis with the words “when the looting starts, the shooting starts”.

On Monday night, fresh detail about those internal discussions emerged, after the Verge obtained recordings of Zuckerberg speaking at an internal meeting on Friday night.

“My first reaction [to Trump’s post] was just disgust,” he added.

Zuckerberg also told employees Facebook would review the policies that allowed Trump’s post to stay up.

The decision on whether to allow Trump’s posts to remain on Facebook could be one of the final major calls made solely by Zuckerberg

Members declined to give any detail what was discussed on Tuesday, although a spokesperson for the Oversight Board suggested Trump’s posts are the sort of issue they will rule on in the future: “There are many significant issues relating to online content that we recognise people want the board to consider