A Mexican woman seeking asylum suffered from a miscarriage after she fell on her stomach while she was shackled in an immigration detention facility, despite the fact that pregnant women are not supposed to be restrained.

According to the American Civil Liberties Union (ACLU) of Southern California, Monserrat Ruiz Cuevas found out that she was pregnant on Mother's Day while she was in custody at the Mesa Verde Detention Center in Bakersfield, California. Although she was with child, she was "fully shackled in leg and arm restraints" on a trip to the hospital, said the American Civil Liberties Union of Southern California in a letter Thursday to Immigration and Customs Enforcement, according to The Associated Press.

The next day, the 24-year-old woman experienced heavy bleeding and was taken back to the hospital, where medical officials later confirmed that she had lost her baby.

Now, the ACLU is speaking out on her behalf in effort to prevent another pregnant woman from suffering from the same tragic lost.

"Shackling pregnant women is absolutely inhumane," reads a statement issued by the local ACLU chapter. "It is also a clear violation of Immigration and Customs Enforcement (ICE) policies and Congress' directive prohibiting the use of force and restraints on pregnant women. ICE's detention policies bar restraining pregnant women, including during transportation, absent 'extraordinary circumstances that render restraints absolutely necessary.'"

"She shouldn't have been shackled," said ACLU attorney Michael Kaufman. "She did fall on her belly, and the next day she miscarried. Whether or not this is the actual cause of it, she shouldn't have been shackled."

The GEO Group, which runs the facility, said additional training and procedures were implemented following Ruiz's case to ensure that policies on restraints are properly followed, "including in cases when a pregnancy may not be immediately known."

Immigration officials also confirmed that they are reviewing the allegations.

"While that inquiry is still ongoing, ICE's preliminary review of documentation and witness statements associated with this case indicate many of the allegations are unsubstantiated," the agency said in a statement, reports The AP.

Ruiz, who crossed the U.S.-Mexico border in early May after fleeing threats to her family, has since been released on bond and is living in Northern California, her lawyers said.