from NBC news:

Phoenix's airport was recovering late Thursday after problems with a TSA automated luggage screening system resulted in a pileup of more than 3,000 bags being left behind, transportation officials said.

The problems at Phoenix Sky Harbor International Airport began at sround 6:45 a.m. and involved "unprecedented technical issues" involving a computer server that allows automated screening, Transportation Security Administration spokesman Nico Melendez said.

Thousands of bags and other pieces of luggage were stored in an airport parking lot in 90-degree heat.  The automated system screened checked bags for explosives, Melendez said. Other methods, including using dogs, were used to screen bags.

Airlines arranged for bags to be driven to airports in Los Angeles and San Diego, and then flown to their destinations, the station said. An airport official said the baggage backup did not result in any flight delays.

Southwest sent 1,500 bags by truck to Las Vegas where the bags would be screened and then sent to customers, the airline said in a statement. It called the situation "very challenging circumstances" and said there could be delays in reunited passengers with their luggage.

The foul-up at the Phoenix airport came on the same day that the TSA was slammed at a Congressional hearing for long lines at the nation's airports and retaliation against workers who complain about poor treatment.

Rep. Jason Chaffetz, Republican chairman of the House Committee on Oversight and Government Reform, took particular exception to a series of bonuses totaling $90,000 to assistant administrator Kelly Hoggan, which Chaffetz said was paid out even while a part of the TSA "was in total failure."