Governments and companies around the world began to gain theupper hand against the first wave of an unrivaled globalcyberattack, even as the assault was poised to continue claimingvictims this week.

More than 200,000 computers in at least 150 countries have sofar been infected, according to Europol, the European Union's lawenforcement agency. The U.K.'s National Cyber Security Centre saidnew cases of so-called ransomware are possible “at a significantscale.”

“For now, it does not look like the number of infected computersis increasing,” said a Europol spokesman. “We will get a decryptiontool eventually, but for the moment, it's still a live threat andwe're still in disaster recovery mode.”