Belgian officials have tightened security in the country after the arrest of 14 suspects accused of planning to free an imprisoned member of al-Qaida.
The suspects were detained early Friday in a police raid. Officials say they planned to break Nizar Trabelsi out of prison using weapons and explosives.
Authorities say they are not aware of any other actions the group had planned.
But they say they are taking precautions during the busy holiday season and have tightened security on the metro, railway stations, airports and shopping districts.
The extra security measures will remain in place at least until after New Year's Day.
The U.S. embassy today issued a warning to American citizens of a heightened risk of terrorist attack in Brussels.
Trabelsi is serving a 10-year prison term, for planning to attack a military base in Belgium where U.S. soldiers are stationed. He was arrested in September 2001.
Some information for this report was provided by AFP, AP and Reuters.
