Police say the boy from Aachen, who has not been identified, spoke to an officer via the 110 number. They say he complained: "I have to work all day long. I haven't any free time."
image copyrightGetty ImagesAmid the global debate about race relations, colonialism and slavery, some of the Europeans and Americans who made their fortunes in trading human beings have seen their legacies reassessed, their statues toppled and their names removed from public buildings.
image copyrightReutersimage captionMore than 12 million Africans were forcibly transported across the Atlantic to work as slavesA major DNA study has shed new light on the fate of millions of Africans who were traded as slaves to the Americas between the 16th and 19th centuries.
In a local newspaper interview, Republican Tom Cotton said he rejected the idea that the US was a systemically racist country to its core. He is introducing legislation to ban federal funds for a project by the New York Times newspaper, aimed at revising the historical view of slavery.
The monkeys are snatched from the wild and trained to pick up to 1,000 coconuts a day, People for the Ethical Treatment of Animals (Peta) said. The animal rights group said pigtailed macaques in Thailand were treated like "coconut-picking machines".
Research into the family of US First Lady Michelle Obama has revealed that her great-great-great-grandmother was a slave given away at the age of six. According to genealogist Megan Smolenyak, the girl was described in papers only as "negro girl Melvinia".
Virginia's General Assembly has adopted a resolution, expressing "profound regret" for the role the US state played in slavery. The resolution was passed by a 96-0 vote in the House and also unanimously backed in the 40-member Senate.
The United Nations has launched its International Year to Commemorate the Struggle against Slavery. A ceremony was held in the Ghanaian port of Cape Coast, once one of the most active slave trading centres.
The world must do more to confront the largely unstudied and neglected phenomenon of people-trafficking, the United Nations has said in a report. So little is known about the problem, says the report, that no estimate can be given of the number affected.
Every day millions of professionals work for free - notching up hundreds of hours of unpaid overtime. It's not written into contracts, often it's not even spoken of. It's just part of the 21st Century workplace. Are you putting in a day's work for free today? It may sound like a ridiculous notion.
Slavemaker ants prefer to target the strong over the weak when seeking new servants, researchers have found. Ants were observed actively choosing to attack larger, better defended colonies over smaller, weaker ones.
Descendants of black American slaves are to sue Lloyd's of London for insuring ships used in the trade. High-profile US lawyer Edward Fagan, who secured settlements from Swiss companies in the Nazi gold case, is taking the action for 10 plaintiffs.
A private prison, or for-profit prison, is a place where people are imprisoned by a third party that is contracted by a government agency.
In just a few minutes driving along a road on the outskirts of Milan in northern Italy, we counted 20 women, almost all African, standing by the kerb. It was a cold night, but you wouldn't have guessed it from the outfits they were wearing. I used to have sex with many different men.
Some 12.3 million people are enslaved worldwide, according to a major report. The International Labour Organization says 2.4 million of them are victims of trafficking, and their labour generates profits of over $30bn.
A letter written by former US President Abraham Lincoln has sold for $3.4m (£1.7m) at auction in New York, setting a record for any American manuscript.
Twenty-four men suspected of being held against their will have been found during a raid at a travellers' site. Four men and a woman were arrested on suspicion of committing slavery offences in the raid at Green Acres travellers' site, Leighton Buzzard, Bedfordshire, on Sunday.
Tombs discovered near Egypt's great pyramids reinforce the theory they were built by free workers rather than slaves. The location of the tombs, where workers who built the pyramids of Khufu (Cheops) and Khafre (Chephren) are buried, suggests they were not slaves.
Members of the Cherokee Nation of native Americans have voted to revoke tribal citizenship for descendants of black slaves the Cherokees once owned. A total of 76.6% voted to amend the tribal constitution to limit citizenship to "blood" tribe members.
President George W Bush has described the transatlantic slave trade as "one of the greatest crimes of history". The president, speaking at the start of a five-nation tour of Africa, said: "Liberty and life were stolen and sold.
The Brazilian authorities say they have rescued 95 farm workers who were being kept in slave-like conditions in two south-eastern states, the official Agencia Brasil reports.
Slavery continues to blight the lives of many millions around the world. Although officially abolished in some countries two centuries ago, people trafficking, bonded labour and child labour still exist.
This digital memorial raises questions about the largest slave trades in history and offers access to the documentation available to answer them. European colonizers turned to Africa for enslaved laborers to build the cities and extract the resources of the Americas.
Scientists used spectral imaging to recover the account of the massacre of 400 slaves, which had been written on old newspaper with makeshift ink. The manuscript, written in central Africa, deteriorated rapidly and is now virtually invisible to the naked eye.
slavery slave slave trade