(CNN) Police have responded to at least 125 calls in the past five years alleging sex offenses at shelters that house immigrant children, ProPublica reported Friday. The investigative non-profit said police reports and call logs also document allegations of fights and missing children.

ProPublica said it used public information requests to acquire the documents pertaining to 70 of about 100 shelters run by the Office of Refugee Resettlement, an agency of the US Department of Health and Human Services.

The calls date to 2014, in the final years of the Obama administration.

CNN has not been able to acquire the data used by ProPublica in its report.

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"Our focus is always on the safety and best interest of each child," the Health and Human Services Department said. "These are vulnerable children in difficult circumstances, and HHS treats its responsibility for each child with the utmost care."

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