Europe must improve the regional sharing of intelligence to successfully combat the rise of homegrown militants, policy experts told CNBC a day after deadly explosions hit Brussels.
Global terrorist organization ISIS claimed responsibility for Tuesday's attacks that killed at least 30 people, the latest episode in the group's campaign of large-scale violence on the international stage.
Recent offensives in Paris and Jakarta indicate ISIS is increasingly relying on local fundamentalists, typically trained in ISIS strongholds within the Middle East, to execute suicide bombings and shootings in busy metropolitan areas.
"The key question here is closing the intelligence gap," said Kevin Rudd, former Prime Minister of Australia and president of the Asia Society Policy Institute.
While ISIS is being defeated militarily in Syria and Iraq, foreign fighters who travel to the militant hotbed are returning to their home countries at a "disturbing" rate of about 30 percent, he noted, resulting in the spate of recent attacks. That calls for European governments to step up information gathering on radicalized individuals, which means channeling more funds and manpower to counter-terrorism operations, the 58-year old explained.
"When members of law enforcement approach us as members of parliament or political leaders, seeking more direct powers, I believe we have to be very attentive to their responses as long as we have judicial and parliamentary oversight."
Rudd's comments are at the crux of a hot-button discourse about the encroachment on civil liberties should governments ramp up surveillance and detainment tactics in the global war on terror.