Brennan Linsley, Associated Press
FILE - In this Oct. 9, 2007 file photo, Guantanamo guards keep watch over a cell block with detainees in Camp 6 maximum-security facility, at Guantanamo Bay U.S. Naval Base, Cuba. Guards clashed Saturday, April 13, 2013 with prisoners at the Guantanamo Bay prison as the military sought to move hunger strikers out of a communal section of the detention center, officials said. The confrontation occurred after the commander decided to move prisoners into single, solid-walled cells so that prison authorities could monitor them more closely during the hunger strike, the military said.. (AP Photo/Brennan Linsley, File)

MIAMI — Guantanamo prison staff members were tube-feeding 30 of the 100 hunger-striking captives on Wednesday, the detention center said, reporting an all-time high last reached in 2005.

Three of the captives were being treated in the hospital, said Army Lt. Col. Samuel House, a prison spokesman, although none "currently have any life-threatening conditions."

The Pentagon's Southern Command headquarters had earlier sent medical reinforcements to the remote prison camps, to increase the military deployment of Navy doctors, nurses and corpsmen to about 140 to care for the 166 captives at the sprawling detention center in southeast Cuba.

House disclosed the hunger strike figure a day after guards declared a medical emergency in the maximum security prison during a tour of the facilities by journalists representing al-Jazeera, CNN and Time magazine. A prisoner appeared unconscious to guards, said Navy Capt. Robert Durand, the prison's public affairs officer, so soldiers declared a "Code Yellow," Guantanamo's term for a medical emergency.

"Nobody was hurt," said Durand, noting that there were four Code Yellows declared on Tuesday. "Nothing serious happened" in any of them.

Essentially, he said, hunger strikers are "being lethargic and not having energy." He attributed Tuesday's episodes to "a consequence of hunger striking."

During a visit to the maximum-security lockup in March, Durand said that detainees appeared to faint more frequently while visiting delegations or reporters were at the prison. But he said Wednesday that it was unclear whether Tuesday's episode during the media visit was "coincidental, opportunistic or legitimate."

Durand also said by telephone Wednesday that the prison was not at risk of running short of nutritional supplements. The military had earlier in the hunger strike done a stock check and ordered additional supplies.

The prison camps in Cuba have been wracked by hunger strikes almost from the start. The Pentagon set up the offshore detention center in January 2002.