At least one suspect from the deadly Paris attacks is at large, and was last seen crossing into Belgium.
Prime Minister Charles Michel said the decision to raise the threat alert to the highest level was taken "based on quite precise information about the risk of an attack like the one that happened in Paris ... Where several individuals with arms and explosives launch actions, perhaps even in several places at the same time."
Authorities across Europe, the Mideast and in Washington are trying to determine how a network of primarily French and Belgian attackers with links to Islamic extremists in Syria plotted and carried out the deadliest violence in France in decades, and how many may still be on the run.
A new potential link emerged Saturday in Turkey, where authorities said they detained a 26-year-old Belgian suspected of connections to Islamic extremists - and possibly to the Paris attacks.
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Belgium's national Crisis Center has raised its terrorism alert for the Brussels region to Level 4, which indicates a "serious and immediate threat." Belgium's special security Cabinet held an emergency meeting this morning.
Brussels was the home of Abdelhamid Abaaoud, the suspected organiser of the November 13 Paris attacks, and Belgium has filed charges of "participation in terrorist attacks and participation in the activities of a terrorist organization" against three suspects relating to the Paris attacks.
Heavily armed police and soldiers patrolled Saturday morning at key intersections of the Belgian capital, a city of more than 1 million that is home to the headquarters of the European Union, the NATO alliance and offices of many multinational corporations.
Residents were recommended to avoid gatherings, train stations, airports and commercial districts. Service was halted on the Brussels Metro, as well as on streetcar lines that run underground.