A Labour MP has pushed demands from the African Union for slavery reparations from countries such as Britain.
Bell Ribeiro-Addy highlighted an agreement to table a UN resolution next month branding the slave trade a crime against humanity.
The backbencher has previously urged the UK government to 'engage' in discussions about reparations, saying action is needed to offset the 'enduring legacies of slavery and colonialism'.
However, ministers have been adamant that Britain will not be paying anything.
The African Union, which represents all 55 nations on the continent, has called for 'meaningful reparations' from European powers for ongoing 'systemic injustice' across the region.
It has pledged to team up with Caribbean countries to seek compensation - with some insisting they are owed trillions of dollars.
Ms Ribeiro-Addy has previously urged the UK government to 'engage' in discussions about reparations, saying action is needed to offset the 'enduring legacies of slavery and colonialism'.
The AU agreed at a summit over the weekend that the UN resolution - due to be tabled on March 25 - will seek formal recognition of the transatlantic slave trade as a 'grave crime against humanity'.
Ghana has been tasked with leading on the issue.
In a message reposted by Ms Ribeiro-Addy on social media, Foreign Minister Samuel Okudzeto Ablakwa said the resolution will 'demand reparations including the return of looted objects'.
He told the summit: 'By standing together at the United Nations, we signal to the world that Africa will no longer allow the scale of its historical suffering to be minimised.
'We seek not only recognition, but a global legal framework that paves the way for healing, accountability, restitution and restorative justice.'
The move raises the prospect that Britain - which controlled a quarter of Africa at the height of empire - could find itself facing fresh claims over the slave trade and colonialism.
Britain abolished the slave trade in the early 18th Century and then played a crucial role in smashing the practice worldwide.
Reparations are now being framed more broadly, not only in terms of slavery, but also the return of cultural artefacts, reforms to global economic systems, and compensation for climate change impacts.
Leaders argue that the industrialised nations of the 'Global North' bear historical responsibility for environmental degradation.
Other colonial powers that could face pressure include France, Spain, Portugal, Belgium and Germany - all of which carved up Africa by the late 19th century.
The reparations issue is another headache for Keir Starmer as he struggles to cling on in Downing Street.