"They are individuals or groups of people who have been forced to flee their homes to escape armed conflict, generalized violence and human rights abuses. Millions of other civilians who have been made homeless by natural disasters are also classified as IDPs, but UNHCR is not normally involved with this second group (except in extraordinary circumstances, for example during the aftermath of the 2004 tsunami in Asia and 2005 earthquake in northern Pakistan)." (Quoted from paper)