UN chief Ban Ki-moon came face-to-face yesterday with the despair of Sri Lanka's war-hit civilians as he toured the main refugee camp and flew over the devastated conflict zone.

On a 24-hour visit to the battle-scarred island nation, Ban went on foot through the sprawling Menik Farm camp, 250 kilometres north of Colombo, which is packed with 200,000 civilians displaced by the fighting.

"I'm very moved after what I have seen. I've seen so many wounded," the secretary general said after spending 20 minutes walking through the camp, a sea of makeshift corrugated iron shacks and tents.

Ban's visit comes amid widespread concerns that the government is preventing full humanitarian assistance from getting through to those in the camps after Colombo announced on Monday the Tamil Tiger rebels had been defeated.

Aid agencies must be given "unhindered access" to the nearly 300,000 people in total displaced by the three-decade ethnic conflict, Ban said after his camp visit.

"The government is doing its utmost best," Ban told reporters after meeting President Mahinda Rajapakse in the central Sri Lankan temple town of Kandy.

But there is a "wide gap between what is needed and what can be done," he said, adding he had been assured international relief agencies would get more access to the so-called "welfare camps".

Tamil activists have likened the "welfare villages" to concentration camps because of the barbed wire surrounding them and the ominous presence of armed guards.

"The government lacks the resources," said Ban, who had described earlier the refugees as "badly in need of food, water and sanitation".

"With this in mind, the UN can help," he said. "The UN must be given immediate unhindered access to the camps, the overcrowding must end and there should be special programmes for pregnant mothers and children."

Ban, due to leave for Copenhagen late yesterday, stressed other relief agencies including the International Committee of the Red Cross should also have "freedom of movement" in the camps.

The UN chief also flew by helicopter over the devastated war zone in northeastern Mullaittivu area where the final battles were fought by the rebels, who were seeking a separate state.

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