By David Gauthier-Villars And Sam Schechner 

PARIS--French Interior Minister Bernard Cazeneuve heads to Silicon Valley this week to enlist a new force in his fight on terror: U.S. tech giants.

Weeks after deadly terror attacks in Paris, and days after apparent copycat shootings in Denmark, France's top cop plans to meet on Friday with senior executives at Apple Inc., Google Inc., Facebook Inc., and Twitter Inc.

His message: U.S. tech companies and social networks must do more to rid their services of extremist postings, and should open up encryption to ease government surveillance.

"We are facing a new threat," Mr. Cazeneuve said in an interview ahead of the trip. "We need tech companies to realize that they have an important role to play."

Mr. Cazeneuve's West Coast tour--coming after a layover Wednesday and Thursday in Washington to attend a summit on terror--raises European pressure on U.S. tech companies over how best to use the Internet to fight terrorists.

Executives say it thrusts them into a tricky dilemma--how to support their users' privacy and free-speech rights while also being tough on terrorism.

In Paris and other European capitals, government officials say Islamic State and other insurgencies have succeeded in harnessing social networks to rally scores of young Europeans to their cause, and lure hundreds of converts to the battlegrounds in Syria and Iraq. Online videos showing the beheading of U.S. reporter James Foley and other hostages by Islamic State are terrorism propaganda that must be censored, they say.

But until recently, some of the same European governments were assailing some of the same companies for allegedly being overly cooperative with the U.S. National Security Agency, U.S. tech executives say.

"Internet companies find themselves caught in the middle," said Eduardo Ustaran, a privacy lawyer for Hogan Lovells who represents some tech companies. "On one hand, there is a need to make sure these horrible attacks don't recur. But they feel extremely uncomfortable about being obliged by governments to spy on their own users."

Tension with tech firms on the issue has been building from before the Paris attacks.

At a gathering of European law enforcement representatives in Luxembourg last October, U.S. companies including Google, Facebook, Twitter and Microsoft Corp. pledged to help governments.

But in meetings since then, the European officials and company representatives have sparred on important issues, such as whether the companies can or should pre-emptively filter their services for terrorist content, or respond only when it is flagged by governments, people familiar with the meetings said.

Mr. Cazeneuve, who has dealt with U.S. companies over tax issues during his one-year stint as budget minister until last spring, said he expects them to step up their effort in censoring content that could be regarded as hate speech.

"What would be the interest of tech companies in broadcasting hateful images that incite terrorism?" he said.

When it comes to terror, U.S. tech executives respond that they already cooperate extensively with governments, particularly in emergencies like the ones France and Denmark recently endured, both by removing content from terrorist groups, and by turning over user data.

On January 7, when videos proliferated of masked gunmen shooting a French policeman at close range, Google's YouTube was able to remove copies of the footage in minutes, French officials said. The company says it removed 14 million videos in 2014 for featuring gratuitous violence, incitement to violence or hate speech.

That same day, Microsoft Corp. says it was able to turn over content from email accounts linked to the Kouachi brothers--suspected of being the killers--within some 45 minutes. The request came through an emergency channel from French prosecutors to the U.S. Federal Bureau of Investigation, Microsoft said.

But people within the companies also say that they will only go so far, given the pressure they still feel to fight government surveillance in the wake of the Snowden leaks.

"Over the last three years, first Edward Snowden and now [Islamic State], we have seen the political debate about government access to information swing from one end of the spectrum to the other," said Rachel Whetstone, Google's global head of public policy, in a speech to the Bavarian parliament earlier this month.

Ms. Whetstone is among the Google executives Mr. Cazeneuve is set to meet on Friday, his office said.

One flash point on the agenda is encryption. Politicians and law-enforcement officials in the U.K., France, and U.S. have said that encrypted communications on apps like Facebook's WhatsApp or Apple's new iPhone pose a problem because companies say they don't have the ability to unlock them even when they receive valid law-enforcement requests.

Mr. Cazeneuve says he plans to push the topic in California. "It is a central issue," he said.

Apple Inc. Chief Executive Tim Cook defended the company's stance last week, saying weakening privacy controls could "risk our way of life." Other companies argue that creating back doors to encryption would give a leg up to criminal hackers, and weaken security for all Internet users.

"Given most people use the Internet for the reasons it was intended, we shouldn't weaken security and privacy protections for the majority to deal with the minority who don't," said Google's Mr. Whetstone.

Write to David Gauthier-Villars at David.Gauthier-Villars@wsj.com and Sam Schechner at sam.schechner@wsj.com

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