WASHINGTON (AP) — A federal investigation that included surprise inspections was unable to substantiate 16 accusations by advocacy groups that the government packed into frigid cells children caught crossing the border alone, made them sleep on hard floors and provided inadequate food and medical care. Other claims about treatment of the children are still under review, according to the Homeland Security Department.

Inspector General John Roth said in a memo made public Tuesday that immigrants alternately complain that detention facilities are too cold or too hot, but either way, there are cloth or disposable blankets. Likewise, Roth said food service has also improved since the American Civil Liberties Union and four other advocacy groups in June made 116 allegations of wrongdoing, mistreatment and abuses by border agents. Among the complaints was a lack of food.