WASHINGTON - Security is extra tough at O'Hare Airport on Wednesday in the wake of the terror attacks in Brussels.
Authorities who are undercover and in uniform are patrolling the airport. The TSA is also checking bags more thoroughly.
Travelers were dealing with long, slow lines in the morning.
Meantime, the U.S. State Department has issued a travel warning to all Americans living in or traveling to Europe.
The alert warns that the Islamic State and other terrorist groups continue to plan attacks throughout Europe targeting sporting events, tourist sites, restaurants and transportation.
Americans are advised to be vigilant in public places or when using public transit, to avoid crowded places and to exercise caution during religious holidays or while at large festivals or events.
The State Department advises that U.S. citizens living or traveling abroad should:
- Monitor media and local sources before making plans.
- Follow the instructions of local authorities, especially in an emergency.
- Be prepared for additional security screenings and unexpected disruptions.
- Remain in contact with family members and make sure they know how to reach you in case of an emergency.
- Register in the State Department Smart Traveller Enrollment Program.
The new alert expires June 20, 2016.