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More than 20,000 international passengers were stranded for hours at Los Angeles International Airport on Saturday, waiting on airplanes and in packed customs halls while a malfunctioning computer system prevented U.S. officials from processing the travelers' entry into the country.

Editor's note: Have you been affected by delays at LAX recently? Share your story on our Travel Message Boards.

The U.S. Customs and Border Protection computer system went down around 2 p.m., forcing some planes to sit on the tarmac for so long that workers had to refuel them to keep their power units and air conditioning systems running. Maintenance workers ran trucks around the airport hooking up tubes to service lavatories.

Officials said they had no idea what caused a crucial chip to break down or when the problem would be fully resolved. They said there was no indication of hacking or sabotage.

The system maintains a list of people who should be subject to secondary searches upon entering the country, said Mike Fleming, a customs spokesman in Los Angeles. "The vast majority of people" do not pose a security threat, "but it only takes one," Fleming said. "Obviously a lot of innocent folks have been detained and it is regrettable."

The computer malfunction affected only LAX, and customs said it was willing to divert flights to LA/Ontario International Airport, San Diego International Airport/Lindbergh Field or McCarran International Airport in Las Vegas; one Alaska Airlines flight went to San Diego, Fleming said.

Passengers who are scheduled to depart from LAX today were urged to contact their airlines before going to the airport.

Some of the delays rivaled the worst incidents of last winter, when severe weather left thousands of passengers languishing for up to nine hours on American Airlines and JetBlue planes.

On a British Airways flight from London that had been stuck at its gate for more than three hours, passengers "actually are being very patient," Ventura resident Mel Swope, who was returning with his wife, Judie, from their second home in Alet les Bains, France, said in an interview from the plane. "They're talking on cellphones to family and friends. But the natives are getting restless. People are missing connections."

Coffee, soft drinks and water helped mollify passengers aboard an Alaska Airlines flight from La Paz, Mexico.

"People are pretty positive about it -- they realize these things happen," said Kelly Henderson, a high school math teacher from Lawndale who had been stuck on the tarmac for several hours. "Everyone's been behaving well."

But in the inspection area inside the Bradley terminal, an estimated 1,000 passengers quickly emptied the vending machines and no water was available for at least four hours, according to an airport employee. By the time water arrived, children and elderly passengers were lying on the floor showing signs of dehydration. Water fountains were not accessible due to renovations in the terminal, and the only air conditioning was provided by three industrial fans with limited range, he said.

The system serves five LAX terminals that handle incoming international flights, said Nancy Castles, a spokeswoman for Los Angeles World Airports. By 10 p.m., customs officials estimated that 8,100 people were waiting on planes. Computers were functioning normally at three smaller terminals, but at Bradley, a backup system was running well below normal capacity.

Customs officials were processing about 1,500 incoming passengers an hour; normally they process 2,800.

By late evening, officials moved some passengers to domestic terminals while they waited to be processed through customs.

Airlines send customs a list of all the passengers bound for the U.S. on international flights, and the federal agency combs through those lists to see if any travelers have been flagged by the Department of Homeland Security for special screening. With the computers down, customs cannot access that list, Fleming said.

When passengers deplane off an international flight, they proceed through a hallway and must immediately get through customs before they can pick up their luggage at the baggage claim. There is limited access to benches or seats, and no gift shops or restaurants until passengers pass through customs.

Fleming said the stranded passengers were patient as customs worked to resolve the glitch.

"We've authorized carriers to bring food and water onto airlines to make passengers comfortable," Fleming said. "I've been told there's air conditioning."

Lancelot Barker, captain of Alaska Airlines Flight 211 from Ixtapa-Zihuatanejo, Mexico, said the passengers on his plane were still on board an hour and a half after it had arrived at 6:30 p.m. His plane was parked near a gate, and it was not allowed to open its doors, he said.

Barker said his flight attendants had already run out of food on the flight, and would run out of water at 8 p.m.

"People are just swapping stories, wandering around the aisles," Barker said. "A lot of cellphones are out. People are trying to find out what other people have heard."

But the conditions were deteriorating on the other planes, which had been stuck for as many as seven hours as of 8 p.m., according to radio traffic, Barker said.

"Some people are grumpy about it and others are taking it in stride," he said.

On one Alaska flight, workers were racing to find baby formula for an infant, Barker said.

Alaska operations were "passing the name of the formula" to other workers, who were trying to process it through customs, Barker said.

By keeping passengers on the plane, said American Airlines spokesman Tim Smith, "at least we can. . . offer them beverages and water, rather than just standing in line."

As late as 10:20 p.m., passengers arriving on an Eva Airlines flight from Mumbai were told they would probably have to stay on the tarmac for up to five hours, according to a passenger who e-mailed the Times from the plane.