The steps include more than 2,600 new agents and greater tools for surveillance.
While European citizens can move freely, scrutiny of their travel varies — a weakness used by the Paris attackers. To fix those flaws, officials have proposed creating an air traveler database.
Belgian leaders vow to track him down as Europe continues to deal with a homegrown terrorism threat.
Some analysts say Muslim youth are vulnerable to radicalization because they’re treated as outsiders.
The arrests came hours before Belgium sought new powers to monitor and punish terror suspects.
The dramatic police strikes that foiled “a major imminent attack” coincided with heightened alerts across Europe in the wake of the deadly attacks in Paris.
Islamist recruiting has flourished in the country, and the killings in France have spawned new challenges.
President Hollande said his country’s values cannot be eroded.
Thousands of police officers and soldiers will guard rallies Sunday, a sign of the rising fears of violence by militants living in Europe.
The woman’s whereabouts raise questions of militant associations.