Mexico City, Mexico (CNN) -- Authorities in Mexico revealed additional details Tuesday about an accused American-born drug kingpin detained Monday who they say moved tons of cocaine into the United States. Masked security forces in black uniforms and helmets, rifles in hand, escorted Edgar Valdez Villarreal and some of his accused associates before news reporter More..s and photographers during a news conference Tuesday morning. Valdez is known as "La Barbie" because of his blue eyes and fair complexion, but investigators have described him as one of the most ruthless drug traffickers in Mexico. "The capture of Valdez Villarreal is a high-impact blow against organized crime," said Alejandro Poire, a spokesman for Mexico's president on security issues. "This is an important step in the national security strategy." Valdez was responsible for smuggling about a ton of cocaine a month into the United States, authorities said Tuesday. They also displayed automatic rifles, ammunition and bags believed to contain drugs -- items they said police seized as they arrested him Monday. Authorities said they're continuing to investigate to try to learn more about Valdez's organization. Investigators arrested six people along with Valdez -- four men and two women, the state-run Notimex news agency reported. The six provided logistical help to Valdez in Mexico's Federal District, which includes the capital, Mexico City. Police recovered automatic weapons, nine packets of cocaine and three ...