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Three Americans missing in Mexico for two weeks, no word on their whereabouts, their mother says

MONTEZUMA PASS, AZ - MAY 02:  An obelisk and a barbed wire fence mark the border between the United States and Mexico on May 2, 2010 at Montezuma Pass, Arizona. Although  the U.S. government has spent billions of dollars constructing border defenses in the last decade, critics say that Arizona's border with Mexico was left with less protection, compared with California and Texas. Proponents of Arizona's new immigration enforcement law say that federal inaction led to passage of the law, which has raised fears of racial profiling by police against Latinos. (Photo by John Moore/Getty Images)

MONTEZUMA PASS, AZ - MAY 02: An obelisk and a barbed wire fence mark the border between the United States and Mexico on May 2, 2010 at Montezuma Pass, Arizona. Although the U.S. government has spent billions of dollars constructing border defenses in the last decade, critics say that Arizona's border with Mexico was left with less protection, compared with California and Texas. Proponents of Arizona's new immigration enforcement law say that federal inaction led to passage of the law, which has raised fears of racial profiling by police against Latinos. (Photo by John Moore/Getty Images)  (2010 Getty Images)

The mother of three U.S. citizens still has hope that her children will return safely home after going missing for two weeks in northern Mexico. She said there is no word on their whereabouts.

Raquel Alvarado said that her 26-year-old daughter Erica Alvarado Rivera and her sons, 22-year-old Alex and 21-year-old Jose Angel, traveled on Oct. 13 to El Control, a small town near the Texas border west of Matamoros. They were visiting their father in Mexico.

“The worst thing going through my mind is that I possibly won’t get to see my sons again and my daughter,” she told Action 4 News recently.

She said Monday witnesses saw armed men – identified as members of the Hercules group, a police unit that provides security to Matamoros’ mayor – take her children and she has not heard from them since.

“We don’t know if they are marines or not since there is no paper work, charges or anything,” Alvarado told Action 4 News.

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A spokeswoman for the city of Matamoros did not immediately respond to a request for comment.

The U.S. Department of State has a travel advisory for parts of northern Mexico, noting that some areas are unsafe.

A spokesman for the U.S. embassy confirmed that U.S. officials are monitoring the case and providing consular assistance.

The Associated Press contributed to this report.

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