PARIS — The Louvre Museum and Versailles Palace evacuated visitors and staff Saturday after receiving bomb threats, police said. Meanwhile, the French government started deploying 7,000 troops to increase security around the country after a fatal school stabbing by a suspected Islamic extremist.

The evacuations of two of the world’s most-visited tourist sites come amid heightened vigilance across France following Friday’s school attack, and global tensions linked to the war between Israel and Hamas.

President Emmanuel Macron’s government is worried about fallout from the war in France.

Paris police said officers searched the Louvre museum after it received written bomb threats. The Louvre communications service said no one was hurt and no bomb was found. The museum will reopen Sunday.

The former royal palace at Versailles also received bomb threats, and the palace and its sprawling gardens were evacuated while police examined the area.

Earlier Saturday, Macron’s office announced the mobilization of 7,000 soldiers by Monday night, after the government heightened the national threat alert in the wake of the school attack in the northern city of Arras. The “attack emergency” threat posture allows the government to temporarily deploy extra troops to protect public places, among other measures.

Counterterrorism authorities are investigating the Arras stabbing, and the suspect and several others are in custody, prosecutors said. The motive of the suspect, from the Ingushetia region in Russia’s Caucasus Mountains, remains unclear, and he is reportedly refusing to speak to investigators.