U.S. Sen. Dick Durbin says he'll seek an investigation into how a contract employee was able to sabotage a regional control center and bring Chicago's two international airports to a halt.

Durbin said Sunday that he will ask inspectors general at the U.S. Department of Transportation and the Federal Aviation Administration to investigate whether there was a security breach when the employee entered the building early Friday with a suitcase.

Authorities say 36-year-old Brian Howard of Naperville started a fire in the basement telecommunications room of the control center in suburban Aurora and then tried to commit suicide. He faces felony charges.

At the height of the travel misery Friday, more than 2,000 flights in and out of the airports were canceled, disrupting travel nationwide