The International Committee of the Red Cross, ICRC, is calling on the Sri Lankan government to grant it access to all camps for people displaced by the country's civil war.
ICRC President Jakob Kellenberger said Wednesday the Red Cross would like to check on the conditions and treatment of camp residents.
The United Nations says about 300,000 displaced people are currently in government-run camps.
Kellenberger says some of the people at the camps are being, "interned" for security reasons. Rights groups say many of them are prevented from leaving.
The Tamil Tiger rebels, who began their fight for a separate homeland for the ethnic Tamil minority in 1983, were defeated by government forces earlier this month.
The U.N. estimates that the civil war resulted in up to 100,000 deaths.
Some information for this report was provided by AFP and AP.