LONDON (AP) — Britain and France plan tougher action to tackle online radicalization, as they announced Monday a new joint campaign to stop the internet from being a safe space for terrorists.

The cooperation, unveiled ahead of counter-terror talks Tuesday with French President Emmanuel Macron, includes exploring the possibility of creating a new legal liability for tech companies if they fail to remove content.

"We are united in our total condemnation of terrorism and our commitment to stamp out this evil," May said ahead of the session.

May has been pressing the tech companies to do more to...