WASHINGTON — Several U.S. senators are calling on the Defense Department to investigate reports of ties between American military interrogators and forces from the United Arab Emirates accused of torture.

The leaders of the Senate Armed Services Committee, Republican chairman John McCain and ranking Democrat Jack Reed, call the reports “deeply disturbing.”

The Associated Press reported Thursday on a network of secret prisons across southern Yemen where hundreds are detained in the hunt for al-Qaida militants and held without charges. American defense officials confirmed to the AP that U.S. forces have interrogated some detainees in Yemen, but they denied any participation in, or knowledge of, human rights abuses.

McCain and Reed have asked Defense Secretary Jim Mattis to conduct an immediate review of the reported abuse and what U.S. forces knew.