An internal watchdog auditor said on Wednesday the U.S. government separated “thousands” more children than were previously known. But said that a lack of comprehensive record-keeping means the exact number is unclear.

The auditor also said that at least 118 children had been separated between July 1 through Nov. 7, 2018, after the administration of President Donald Trump officially ended a ‘zero tolerance’ prosecution policy of border crossers that led to some of the separations.