By Maarten van Tartwijk 

AMSTERDAM--European governments are calling on Internet and social media companies to close the accounts of Islamist militants, as part of a wider effort to contain the threat of European extremists returning from Syria, Dutch officials said Monday.

Ivo Opstelten, the Dutch minister of security and justice, said the companies must make greater efforts to ban Islamic militants from using their platforms for recruitment and propaganda.

"Many companies might have [clauses against jihadist statements] in their terms of service, but they don't act," he said in a letter to lawmakers. "These companies must live up to their own rules on postings and delete propaganda of violent jihadists," he said.

Government officials have approached companies like Facebook and Twitter to discuss the issue, a spokesman for Mr. Opstelten said. "We point the companies at their own terms of service. We cannot force them, but we hope they will take action," he said.

Facebook, Twitter and Google weren't immediately available for comment.

The talks are part of an existing effort of European authorities to coordinate intelligence on, and surveillance of, about 2,000 European citizens who have traveled to Syria to fight alongside rebels in their battle to unseat President Bashar al-Assad. Some have returned to Europe in recent months and pose a threat to security, according to national intelligence agencies.

Nine countries, including Germany, France, the U.K. and the Netherlands, will discuss coordinated action in Milan on July 8. The role of social media and the Internet will also be discussed there.

The AIVD, the Dutch intelligence agency said on Monday that the widespread use of social media, fueled by the rising popularity of smartphones, has contributed to a revival of jihadism in the Netherlands. It said 130 Dutch citizens have travelled to Syria to join the fighting, 14 have been killed and 30 so far have returned home.

The AIVD said it would be underestimating the power if social media to see them as just new ways of spreading information. "The impact of social media goes further: they have caused a significant change in the nature of information and communication flows," the agency said. The use of social media enables Islamist militants to disseminate information quickly and widely, while making it more difficult to identify their leaders by intelligence agencies, AIVD said.

Facebook and Twitter have increasingly replaced jihadist web forums that were popular in the past, the agency said. "Radicalizing youth go to Facebook to search for like-minded people, and then post jihadist material," it said. "In relative openness, jihadists enter into discussions on Twitter."

Write to Maarten van Tartwijk at maarten.vantartwijk@wsj.com

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