Chinese workers at a construction site in Brazil for a factory owned by China's electric vehicle producer BYD are victims of human trafficking, Brazilian labor authorities said on Thursday in a growing controversy in BYD's biggest overseas market.

Authorities in Brazil said Friday they are probing Chinese auto giant BYD and one of its contractors for suspected "trafficking" of Chinese workers building a factory in the South American country. Federal prosecutors in Brazil are weighing possible criminal action after labor inspectors

Scores of Chinese construction workers were rescued from slavery-like conditions at a BYD factory site in Brazil, according to authorities. BYD plans to terminate its contract with Jinjiang Construction.