It was the first time in a year that Venezuela opened the border. Photo: Reuters

The frontier, closed by Venezuela last August as part of a crime crackdown, was to open for 12 hours.

Venezuela is going through a deep economic crisis and many say they struggle to feed their families.

Last week, about 500 Venezuelan women broke through the border controls in search of food.

Venezuelan President Nicolas Maduro ordered the border closure because, he said, the area had been infiltrated by Colombian paramilitaries and gangs.

The measure also prevents subsidised goods from being smuggled from Venezuela into Colombia.

Supermarkets were crowded with Venezuelans buying basic supplies such as rice, oil, flour and sugar, which are expensive in their country because of the shortages.

Gloria Archila was all smiles. "They had everything," she said, comparing the situation here with the empty shelves in markets back home.

Everyone seemed to have a story like this - a mother who was looking for medicine for her daughter, another who described being "happy to see so much food together".

They complained about how devaluated their Venezuelan bolivar was, limiting their purchase power. They also found goods smuggled from Venezuela being resold here. But, by and large, as they returned home in packed buses, they were triumphant - and with full bags.

An unnamed woman who crossed with her husband and two young children told the Efe news agency it was "unfair" to keep the border closed.

"We are from San Antonio, and the reality is that we do not have any food to give to our children."

Venezuelans who want to cross into Colombia in states where the border has been closed need a special permit to do so.

But as the scarcity of food gets worse in Venezuela, many have crossed the porous border illegally.