Denver International Airport officials are investigating the cause of an apparent power surge that shut down security checkpoints and passenger trains and delayed some flights.
DIA spokeswoman Jenny Schiavone told KMGH-TV that trains and security checkpoints were down for about 20 minutes Thursday and some passengers weren't properly screened.
Schiavone says some flights were held at gates for 40 minutes to an hour until passengers could be located and screened.
The problem began around 2:30 p.m. Thursday and was initially reported as a security breach.
Schiavone says officials now believe the problem was likely due to a power surge.
The airport was back to normal by 3:45 p.m.
Information from: KOA-AM, http://www.850koa.com