The Thai Army yesterday moved more than 28,000 Cambodian refugees away from the area of border fighting that is expected to intensify with the onset of the dry season.

The move was prompted by a mortar attack Sunday on the refugee's temporary camp. The attack killed four persons and wounded 12.

The camp was across the border from a stronghold of Khmer Rouge guerrillas loyal to ousted prime minister Pol Pot. The stronghold was attacked by Vietnamese-led troops of the Phnom Penh government.

A Supreme Command spokesman said the 28,000 refugees were shifted from the village of Tap Phrik, about 20 miles south of the eastern Thai border town of Aranyaprathet, to another temporary camp 2 1/2 miles to the south where another 3,500 refugees were gathered.

International aid organizations have started transporting large quantities of food to the border to feed Cambodians fleeing famine and war.

Aid also has started to arrive in Phnom Penh. A spokesman for the United Nations Children's Fund said the agency and the International Committee for the Red Cross would send 165,000 metric tons of supplies to Kompong Som, Cambodia's only deepwater port, in the next six months.