The survey showed 63% of displaced people in the camps around Goma in eastern Congo had lost contact with at least one close relative during the conflict.

More than a quarter (26%) had lost a child, and 17% had lost their husband or wife.

Brendan Gormley, chief executive of the Disasters and Emergency Committee (DEC), said: "The people in the Congo have endured terrible physical conditions and this survey gives a glimpse of the emotional turmoil most of them are enduring too.

"Families have been torn apart by war. Many of those we surveyed have no idea if their children, spouses and other close relatives are alive or dead.

"As well as providing life-saving water, food, sanitation and medical care, many charities are trying to reunite families. To do this, we need the help of the British people.

"We urgently need your donations to reduce the suffering and bring hope to the Congo."

The survey was produced by Oxfam, World Vision, Save the Children, Action Aid and Merlin.