Dutch Prime Minister Mark Rutte on Monday officially apologised for 250 years of the Netherlands' involvement in slavery, calling it a "crime against humanity".

The apology comes almost 150 years after the end of slavery in the European country's overseas colonies, which included Suriname in South America, Indonesia in the east and Caribbean islands such as Curacao and Aruba.

In the first of the former Dutch colonies to react, Aruba's Prime Minister Evelyn Wever-Croes accepted the apology, but others deplored a lack of concrete action or dialogue.

"Today on behalf of the Dutch government, I apologise for the past actions of the Dutch state," Rutte said in a speech, repeating the apology in English, Papiamento and Sranan Tongo, languages spoken on the Caribbean islands and in Suriname.

"The Dutch State of the Netherlands... bears responsibility for the great suffering inflicted on enslaved people and their descendants," Rutte told an audience at the National Archives in The Hague.

"We, living in the here and now, can only recognise and condemn slavery in the clearest terms as a crime against humanity," he added.

Dutch ministers have travelled to seven former colonies in South America and the Caribbean for the event.

"I don't see much with regard to action by the Netherlands and it's a shame," Iwan Wijngaarde, head of the Federation of Afro-Surinamese, told AFP after the speech.

"What was completely missing in this speech was responsibility and accountability," Armand Zunder, president of Suriname's national reparations commission, told AFP.

- 'Complicated matter' -

The Dutch government says several major commemorative events will be held from next year and has announced a 200-million-euro ($212-million) fund for social initiatives.

"We think that in time there should be a fund which is counted in terms of billions," Zunder said.

Dutch Deputy Prime Minister Sigrid Kaag said on an official visit to Suriname last week that a "process" would begin leading up to "another incredibly important moment on July 1 next year".

Descendants of Dutch slavery will then celebrate 150 years of liberation from slavery in an annual celebration called "Keti Koti" (Breaking the Chains) in Suriname.

But the plan has caused controversy, with groups and some of the affected countries criticising the move as rushed, and saying the lack of consultation by the Netherlands smacked of a colonial attitude.

Rutte in his speech on Monday said that choosing the right moment was a "complicated matter".

"There is not one right time for everyone, not one right word for everyone, not one right place for everyone," he said.

- 'Golden' Age? -

The Dutch funded their "Golden Age" of empire and culture in the 16th and 17th centuries by shipping around 600,000 Africans as part of the slave trade, mostly to South America and the Caribbean.

At the height of its colonial empire, the United Provinces known today as the Netherlands possessed colonies like Suriname, the Caribbean island of Curacao, South Africa and Indonesia, where the Dutch East India Company was based in the 17th century.

In recent years, the Netherlands has been grappling with the fact that its Rembrandt and Vermeer-filled museums and historic towns were largely built on the back of that brutality.

Spurred by the Black Lives Matter movement in the United States, it has also raised questions about racism in Dutch society.

Pressure has been growing at home with the cities of Amsterdam, Rotterdam, The Hague and Utrecht formally apologising for the slave trade.

Rutte had long resisted, previously saying the period of slavery was too far back and that an apology would ignite tensions in a country where the far right remains strong.

He has now changed tack, but that has not pleased everyone.

- 'A first step' -

Sint Maarten's Prime Minister Silveria Jacobs on Monday called it a "forced apology" but invited dialogue.

"We are not at the stage that we can either accept or reject the statements/apologies," she said on NOS public radio.

But on Aruba, Wever-Croes told the ANP news agency the island accepted the apology, but stressed "it is a first step."

On Monday, Dutch cabinet ministers would be in Suriname, Bonaire, Sint Maarten, Aruba, Curacao, Saba and St. Eustatius to "discuss the cabinet response and its significance on location with those present" after the Rutte speech, the government said.

Slavery was formally abolished in Suriname and other Dutch-held lands on July 1, 1863, but the practice only really ended in 1873 after a 10-year "transition" period.

Slavery commemoration groups say any apology should come on the 150th anniversary of that date, in 2023, instead of the "arbitrary" date of December 19 this year.