US government inspectors reviewing an El Paso, Texas, migrant station warned as far back as May that conditions were so bad that border agents were arming themselves for possible riots, according to a report.

The findings in a report by the Department of Homeland Security’s Office of Inspector General that NBC News obtained counters acting DHS Secretary Kevin McAleenan’s assertion on Friday that news stories of poor conditions for children were “unsubstantiated.”

The internal report said that during a May 7 tour, inspectors found that only four showers were available for 756 immigrants, more than half of the immigrants were being held outside, and those inside were kept in cells housing more than five times their capacity.

A cell meant for a maximum of 35 people held 155 adult males with only a single toilet and sink, NBC reported, citing the report. The crowding was so extreme that the men could not lie down to sleep.

Temperatures in the cells climbed to over 80 degrees, according to the report, in which the name of the El Paso facility was redacted.

“With limited access to showers and clean clothing, detainees were wearing soiled clothing for days or weeks,” the report said.

The facility did have formula and baby food for children, but it did not have clean clothing or soft mats for them to sleep on, it said.

Meanwhile, border agents remained armed in holding areas amid concerns of possible unrest, the report said. Agents normally store their weapons in a lockbox when they enter holding areas, a DHS official said.

Medical concerns also mounted last month, when agents reported taking sick migrants to a hospital five times a day, treating 75 people for lice in a single day and trying to quarantine outbreaks of the flu, chickenpox and scabies.

Last week, lawyers allowed inside a Border Patrol facility near nearby Clint, Texas, reported children taking care of other kids and living in soiled clothing.

During a news conference Friday, McAleenan denied the lawyers’ allegations and defended operations at the facility, about 25 miles south of El Paso.

US lawmakers last week passed a $4.6 billion aid package to address a migrant surge at the border as a wave of Central Americans seek to reach the US.

Liberal House Democrats had pushed for the legislation to include additional protections for migrant children, but the bill eventually passed without them.

Representatives for the Department of Homeland Security did not respond to NBC’s request for comment, according to the news outlet’s report.