FACTBOX - The crisis over Pakistanis displaced by fighting

REUTERS - Pakistan needs to ensure appropriate conditions, especially security, are in place before encouraging people displaced by fighting to go home, a top U.N. humanitarian official said on Wednesday.

Following are some facts about the displaced.

- About 2 million people have fled from their homes because of the fighting, most since late April from the Swat valley and neighbouring districts.

- The U.N. refugee agency says it is grappling with one of the largest, fastest and most complex operations it has faced in years.

- Most of the displaced are living with family or friends in "host communities" but about 280,000 are in more than 20 tented camps on the lowland below Swat.

- The government, the army, the United Nations and other aid agencies are helping people in the camps, those staying with "host communities", and the hosts, most of whom are also poor.

- The United Nations has received $223 million in response to a $543 million aid appeal it launched in May in a bid to avert a long-term humanitarian crisis.

- Authorities have said it is safe for people to return to Buner district, to the southeast of Swat, and about 55,000 families, or about 380,000 people, have gone back there, the government agency overseeing relief efforts said.

- An announcement would be made this week on when people can start going home to Swat, a spokesman for the agency said on Tuesday, despite daily clashes in parts of the valley.