Angelina Jolie wrote a farewell letter for Brad Pitt after becoming a "target" on a UN mission

The 36-year-old actress – who has six children with the ‘Moneyball’ star – was so frightened during the Afghanistan trip that she put pen to paper for a few final words.

She said: “I had moments where I've been in a house and people have pounded on the doors and screamed at you and said, ‘We know she's in there and we want her passport’, and I've had moments recently when I went to Afghanistan, and I've got off the plane thinking, this is fine.'

“And then I got there and they said, ‘the people are very angry with you. They are angry that you are a woman and you are American and you are with UNHCR (United Nations High Commissioner for Refugees), so you are the target’.

“And so they gave me a briefing and they said everybody needs to write their blood type down.”

Reliving the experience in an interview with OK! Magazine, she continued: “There's a guy outside with a bulletproof vest, he put his passport in the vest, because he would be the one to take me out.

“I wrote a note to Brad in the process and figured if anything happens he'll find it.

“I was fine, but then two weeks later they did attack the UN and they killed everybody in the bunker.

“I figured if anything happened he'd find it.”