U.S. Border Patrol agents are searching the Rio Grande for a missing 2-year-old, officials said.

The girl is a national of Brazil who was crossing the river before she went missing, U.S. Customs and Border Protection wrote in a release Tuesday.

Agents detained a woman from Haiti late Monday, shortly after she crossed the river from Mexico, and she alerted officials that she’d lost her daughter.

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“Any time a child is lost it is a tragic event,” said Del Rio Sector chief patrol agent Raul Ortiz. “I can not imagine the anguish the parents of this young girl must be feeling and I hope our search efforts pay off with a positive outcome.”

Border patrol agents and law enforcement teams from Ciudad Acuna, Mexico, continue to look for the missing girl.

The search for the missing girl continued into Tuesday, with officials using a remotely operated underwater vehicle and boats from both Border Patrol and Mexico.

The girl’s disappearance comes a week after a father and daughter drowned in the Rio Grande while trying to cross the border into the U.S.

A photo of the Salvadoran migrants lying face down in the river has since gone viral, drawing criticism of the Trump administration for its hard-line immigration policies.