Peña Boulevard was closed at Tower Road on Saturday, Oct. 10, after a crash involving multiple vehicles, Denver International Airport said. The airport issued a traffic alert at about 5:40 p.m., warning drivers to expect delays and backups. Traffic was being diverted from Peña Boulevard onto Tower Road, with drivers able to return to Peña using the Tower Road ramp. Airport officials did not release information about injuries or the people involved, and had not said how long the closure would last. Crews were working to clear the area, the airport said.