The surviving nun of the ISIS attack on an old-age home in Yemen has provided an account of the incident, detailing the gruesome killings.

Sister Sally, the superior of the Missionaries of Charity, an order that was founded by Mother Teresa of Calcutta, miraculously survived the horrendous barrage of death and destruction.

Her report given to her superiors details how Islamic-State gunmen “tied them up, shot them in the head and smashed their heads.”

She describes how, after realizing it would be impossible to run to the convent to warn of the attack, she hid in the refrigerator room.

The hand-written report began when “ISIS dressed in blue killed guard and driver. 5 young Ethiopians men (Christians) began running to tell the sisters ISIS was here to kill them. They were killed one by one. They tied them to trees, shot them in the head and smashed their heads….

"[Sister Sally] saw the sisters and helpers killed. The ISIS men were already getting to the convent so she went into the Refridgerator [sic] Room since the door was open. These ISIS men were everywhere searching for her as they knew there were 5 [nuns in total]. At least 3 times they came in the Fridgerator Room. She did not hide but remained standing behind the door – they never saw her. This is miraculous.”

Sixteen people were killed in the attack, including four of the five nuns. The Islamic State had targeted the home and apparently studied when the nuns would be present. The report notes the order of nuns was “the only Christian presence” in Aden “and ISIS wants to get rid of all Christianity.”

That sentiment was corroborated by the fact that the jihadis “smashed and destroyed” all Christian artifacts at the site — the tabernacle, altar, crucifix, statues, Bibles and prayer books.

The gunmen entered the old-age home, which housed 80 people, by persuading the guard at the gate that they wanted to visit their elderly mother. As soon as they gained entry, they shot the guard dead and began moving from room to room, handcuffing their victims before shooting them and smashing their heads.

The murdered nuns were all slated to return to their home countries, but according to a spokeswoman for the order, “They opted to stay to serve people.”

Sister Sally also insisted on staying to serve at the home after the attack, but police forced her to leave, saying the Islamic State would certainly return “to finish the job.”