Two members of a London criminal gang who used a young woman to carry and sell drugs have been convicted for human trafficking in a landmark case in Britain, police said on Wednesday.

The two men, Mahad Yusuf, 20, and Fesal Mahamud, 19, pleaded guilty on Tuesday at Swansea Crown Court in Wales to trafficking a young person for the purposes of exploitation under Britain's Modern Slavery Act, and to conspiracy to supply class A drugs.

The gang lured the victim into a car in London after making contact on social media and drove her to South Wales, where Yusuf held the 19-year-old in a property for five days and forced her to store drugs against her will, investigators said.