A second glitch in as many days with the U.S. Customs’ screening system stalled international passengers headed in and out of Los Angeles International Airport early Monday morning, according to federal and city officials, the Daily Breeze reports.

Meanwhile, the U.S. Customs and Border Protection is investigating the root cause of the electrical problems and studying measures to keep the outages from occurring again.

The screening system first went down around 2 p.m. Saturday, leaving nearly 17,400 passengers on 73 flights stranded for about 10 hours at LAX’s Tom Bradley International Terminal.

The system was operating by midnight but shut down again around 11:50 p.m. Sunday, according to Michael Fleming, a spokesman for the Customs and Border Protection’s Los Angeles field office.

Airport operations were up and running again by 2 a.m. Monday, but that problem delayed about 1,700 passengers, Fleming said.

Read the full Daily Breeze story .