PARIS (AP) — An attacker armed with a knife killed three people at a church Thursday in the Mediterranean city of Nice, French authorities said. It was the third attack in two months in France, which has grown increasingly tense during a furor over caricatures of the Prophet Muhammad that were re-published by the satirical newspaper Charlie Hebdo.

Other confrontations and attacks were reported Thursday in the southern city of Avignon and in the Saudi city of Jeddah, but it was not immediately clear if they were linked to the attack in Nice.

Thursday’s assailant in Nice was wounded by police and hospitalized after the killings at the Notre Dame Bascilica, less than a kilometer (half-mile) from the site in 2016 where another attacker plowed a truck into a Bastille Day crowd, killing dozens of people.

France’s anti-terrorism prosecutor’s office opened an investigation into the Nice killings, which marked the third attack since the September opening of the trial of 14 people linked to the January 2015 killings at Charlie Hebdo and a kosher supermarket. The gunmen in the 2015 attacks claimed allegiance to the Islamic State group and al-Qaida.

Thursday's attacker was believed to be acting alone and police are not searching for other assailants, said two police officials, who were not authorized to be publicly named.

“He cried ‘Allah Akbar!' over and over, even after he was injured,” said Nice Mayor Christian Estrosi, who told BFM television that two women and a man had died, two inside the church and a third who fled to a nearby bar but was mortally wounded. “The meaning of his gesture left no doubt.”

French media showed the Nice neighborhood locked down and surrounded by police and emergency vehicles. Sounds of explosions could be heard as sappers exploded suspicious objects.

In the southern city of Avignon later in the morning, an armed man was shot to death by police after he refused to drop his weapon and a flash-ball shot failed to stop him, one police official said. And a Saudi state-run news agency said a man stabbed a guard at the French consulate in Jiddah, wounding the guard before he was arrested.

The French Council of the Muslim Faith condemned the Nice attack and called on French Muslims to refrain from festivities this week marking the birth of Muhammed “as a sign of mourning and in solidarity with the victims and their loved ones.”

Islamic State extremists issued a video on Wednesday renewing calls for attacks against France.

The lower house of parliament suspended a debate on France's new virus restrictions and held a moment of silence Thursday for the victims. The prime minister rushed from the hall to a crisis center overseeing the aftermath of the Nice attack. French President Emmanuel Macron was headed to Nice later in the day.

Less than two weeks ago, an assailant decapitated a French middle school teacher who showed caricatures of the Prophet Muhammad for a class on free speech. Those caricatures were published by Charlie Hebdo and cited by the men who gunned down the newspaper's editorial meeting in 2015.

In September, a man who had sought asylum in France attacked bystanders outside Charlie Hebdo's former offices with a butcher knife.