sentences:  In 1991, AHMSA was privatized and acquired by GAN (North Steeler Group).In 2005, the company began an upturn in production.Alonso Ancira, the owner and president of "Altos Hornos", was arrested by the Interpol in connection with the 2014 sale of a fertilizer plant to PEMEX, the Mexican-state oil company, on May 28, 2019.