European Union foreign ministers meet in Brussels Monday in the aftermath of deadly attacks in France and anti-terror raids in Belgium.
The ministers will discuss a range of options as the bloc prepares for a special summit next month dedicated to fighting terrorism.
Much of Europe remains tense and on high alert as Belgium's justice minister says the alleged mastermind in last week's foiled terror attack remains at large.
Koen Geens says the suspect was not among four people arrested in Greece where he was believed to have fled. But Belgian prosecutors still plan to ask Greece to extradite one of those arrested in connection with the thwarted terror strike.
Belgian media have named the wanted mastermind of the plot as Abdelhamid Abaaoud. The 27-year-old Belgian of Moroccan descent is suspected of leading an Islamic extremist cell in the eastern town of Verviers. Authorities say the cell was about to launch a major terrorist attack on police targets before officers raided their hideout Thursday, killing two in a fierce gunbattle.
Meanwhile, Europe is still reeling from terror attacks in Paris earlier this month that killed 12 people at the Charlie Hebdo magazine, a police officer, and four people in a Jewish supermarket.
French authorities say the two brothers in the Charlie Hebdo massacre who were killed by police have been buried in secret, unmarked graves in France.