Good to know that security is on their toes over at the Nokia Theatre.

Los Angeles police confirm to E! News that a security breach occurred at a checkpoint near the downtown Los Angeles venue at about 3:30 p.m., just as the red carpet action was starting to pick up before the 60th Annual Primetime Emmy Awards.

According to authorities, three people who were planning to attend the ceremony were detained for questioning after guards found an aerosol rifle (similar in looks to a BB gun) in the trunk of their car at a checkpoint near the arrivals area.

"A car got past a checkpoint, and it had to be checked by the bomb squad," a law-enforcement source told E! News.

The incident prompted a 15-minute halt in the chauffeur action, as the throughway was shut down and A-listers such as Eva Longoria Parker had to ditch their rides and hoof it a short distance to the carpet, the source said.

Some attendees also opted to take cover behind a nearby wall after getting out of their cars, according to police.

No injuries were reported, and the Emmys kicked off at 5 p.m. PT as scheduled.