The situation in Gaza is "beyond catastrophic" with casualties mounting along aid convoy routes and in shelters as Israel continues to bar many medics, UN humanitarians said in a press release on Wednesday.

The UN Office for the Coordination of Humanitarian Affairs (OCHA) said that more people are being killed and injured along convoy routes or where they are staying.

OCHA said that a limited number of trucks carrying commercial goods were reportedly allowed entry into Gaza on Tuesday.

The office said that initial reports from its ground partners indicate that the items included rice, sugar and vegetables, but they are still following up to obtain more clarity on it.

Sugar remains one of the most expensive items in the market in Gaza. "A two-ounce (57 grams) bag costs some $170," said OCHA. "Eggs, poultry and meat have disappeared from the market."

OCHA said that the Ministry of Health in Gaza reported five new malnutrition-related deaths in the past 24 hours, bringing the total to about 200 deaths, half of whom were children.

The Food and Agriculture Organization (FAO) published its latest satellite survey on Wednesday as well, showing only 1.5 percent of Gaza's farmland is accessible and undamaged – just over 2 square kilometers. The survey warned that the Palestinian territory was on the brink of a "full-scale famine."

In its previous survey, published at the end of May, the FAO had indicated that less than 5 percent of Gaza farmland was both accessible and undamaged, based on data from the UN Satellite Center.

The survey, which dates from July 28, found that 8.6 percent of Gaza's farmland was accessible, but only 1.5 percent, or 2.3 square kilometers, was both accessible and usable.

An additional 12.4 percent of farmland is undamaged, but not accessible.

An overwhelming majority of Gaza's farmland – 86.1 percent – is damaged, the survey found.

"Gaza is now on the brink of a full-scale famine," FAO Director-General Qu Dongyu said in a statement.

"People are starving not because food is unavailable, but because access is blocked, local agrifood systems have collapsed, and families can no longer sustain even the most basic livelihoods," he added.

Qu called for safe and sustained humanitarian access to restore local food production and avoid a further loss of life.

"The right to food is a basic human right," he said.

(With inputs from Xinhua and AFP)