By Ruth Bender, Noemie Bisserbe and Sam Schechner 

PARIS--When gunmen killed 17 people in a string of attacks in Paris in January, France tightened security and cracked down on French nationals traveling to territory controlled by radical Islamist groups.

But the attack on a relatively small-scale industrial gas plant in southeastern France on Friday, which left one victim decapitated, exposes the unpredictable threat France faces even far away from its capital.

Friday's attack hit an outpost of U.S.-based industrial gas firm Air Products & Chemicals Inc. that had some flammable chemicals used by the attacker, but otherwise no obvious reason to be a target for terrorists.

The facility, in Saint-Quentin-Fallavier, is just one of 22 registered locations the U.S.-based company has in France, and employed fewer than 50 of the company's 21,000 employees worldwide.

Some experts warn that attacks on industrial sites like the facility hit on Friday, as opposed to a political or religious target, could make the combat against militants even tougher as it broadens places of potential future targets.

"It's an important symbolic turning point," said Claude Moniquet, CEO of Brussels-based think tank European Strategic Intelligence and Security Center. "All of a sudden, the amount of potential future targets are multiplied by 10, 20 or even 30 if you consider that there are thousands of company sites across the country."

France has stepped up its fight on terrorism in the wake of the Charlie Hebdo and Hyper Cacher shooting sprees nearly six months ago -- one of the deadliest attacks in France's history. Legislators have approved a new surveillance law, while the government has boosted spending on military and intelligence and taken action to crack down on radicalization among young people. But the new attack reveals the tricky task Paris faces to combat an ever growing threat of terrorism on its soil.

"The jihadist threat weighs heavily on our country. Faced with this, we must never let down our guard," Prime Minister Manuel Valls said in the hours after the attack that left one person dead, found with his head severed at the site.

Since the January attacks, France has been on its highest terror alert level and soldiers have been mobilized to protect possible targets, including schools, newspaper offices and places of worship.

In April, President François Hollande pledged to raise France's military spending by 3.8 billion euros ($4.2 billion) over the next four years and permanently dedicated 7,000 soldiers to homeland security to counter the threat of terrorist attacks.

The government also said it would create 2,680 jobs and invest 425 million to bolster surveillance and intelligence.

"Over the past few months, the government has taken every possible step to ensure the safety of French people, who are facing a threat that remains very high," French Interior Minister Bernard Cazeneuve said Friday.

The government also moved quickly to repair holes in France's counterterrorism apparatus--relying on new laws to increase surveillance powers and take more rapid action on suspects.

Before the attacks, the French Parliament had passed laws that increased surveillance powers and dramatically expanded the definition of terrorism--from acts that are carried out as part of an established group or network to acts of "individual enterprise."

After the attacks, the government accelerated a contentious intelligence bill to further expand the government's ability to spy on phone and Web communications without judicial approval. The law was approved this week and now faces a constitutional review before it is enacted.

"The government has done a lot, many attacks were thwarted," said Mr. Moniquet of the security think tank. "But zero risk is simply not possible."

Officials have prevented at least five attacks in recent months, including catching a heavily armed man in April suspected of planning attacks on churches

It remains unclear why Friday's attacker chose to hit the facility in Saint-Quentin Fallavier. Since the 1990s, the facility has been included on a list of sensitive factories, but its risk is rated as "low."

In April, the company said it had won a deal with Saudi Aramco to build and own a minority stake in what the firms described as the world's largest facility to produce oxygen and nitrogen. But many other firms in France also have ties to Saudi Arabia.

Air Products said Friday that it is working closely with authorities and that "security has been increased at locations around the world as a precautionary measure."

Mr. Hollande was quick to try to reassure people. "We must not give in to fear," he said.

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