Ministers from France, Germany, Poland and Spain met a day before EU foreign policy chief Federica Mogherini briefs a special UN Security Council meeting on the bloc's plans to stem the influx of migrants, thousands of whom have died in their efforts to reach Europe.
"First we must exchange intelligence to locate the smugglers and their means of transport," French Defence Minister Jean-Yves Le Drian said after the meeting in the western French city of Lorient.
The European Union is looking to the Security Council for endorsement of a plan which could involve destroying boats operated by traffickers.
More than 5,000 refugees have died over the past 18 months as boats operated by smugglers have capsized off Libya's coast, triggering alarm among European leaders seeking to halt the flow.
More From This Section
Most set sail from the lawless shores of Libya, where the breakdown of government since the ouster of Moamer Kadhafi has allowed ruthless people traffickers to operate with impunity.
UN Secretary-General Ban Ki-moon has also criticised the plan, saying that destroying boats could affect the livelihoods of Libyan fishermen, who may be forced into dealings with the smugglers to make ends meet.
For now, Brussels is concentrating on stopping unflagged boats and sharing intelligence on traffickers, according to EU sources. That could include information gathered from radar, aerial surveillance and wiretaps.
The aim is "to identify the points of departure, the security situation on the ground" and establish a multinational team of planning officers, said a military source in Paris.