A fatal stabbing in Illinois, a gun pointed at protesters in Pennsylvania, vandalism at synagogues and harassment of staff at a Palestinian restaurant all are raising fears the war between Israel and Hamas is sparking violence in the United States.

The tensions follow a familiar pattern of crimes against Jewish and Muslim communities rising when conflict erupts in the Middle East and Americans have been killed or taken hostage.

"We have a two-pronged threat to American faith communities," said Brian Levin, founding director of the Center for the Study of Hate and Extremism at California State University, San Bernardino.

In one of the most troubling recent incidents, a landlord in Plainfield, Illinois, is accused of attacking a Palestinian American tenant and her son with a knife Saturday, purportedly because of their Muslim faith, stabbing the 6-year-old boy to death and injuring the mother. The sheriff, prosecutors and family all said the boy and his mother were targeted for being Muslim. More specifically, prosecutors said the landlord was "angry ... for what was going on in Jerusalem" and his wife told police her husband feared they would be attacked by people of Middle Eastern descent.

In Pennsylvania, a man was charged with felony ethnic intimidation after police said he pointed a gun and yelled slurs at attendees of a pro-Palestinian rally near the state Capitol on Friday. In Boston, the word "Nazis" was spray-painted across the sign of the Palestinian Cultural Center for Peace.

"There's a lot of fear. There's a lot of anxiety and uncertainty in everything that's happening," said Abed Ayoub, national executive director for the American- Arab Anti-Discrimination Committee. He said the group has received more than 100 reports including verbal harassment, threats, intimidation and physical attacks.

"It's very reminiscent of the early days of post-9/11, where people didn't want to go outside, they didn't want to send their kids to school," he said. "They're just worried about being in public and being approached."

In California last week, flyers spreading anti-Jewish rhetoric were left in neighborhoods and on vehicles in the city of Orange. And in Fresno, police said a man suspected of breaking windows and leaving an anti-Jewish note at a bakery also is a "person of interest" in the vandalism of a local synagogue.

Julie Platt, chair of the Jewish Federations of North America, said synagogues and Jewish community centers around the country have been strengthening their security programs, but that she does not want to see members of her community duck for cover.

"I think the whole point of this is to terrorize us psychologically," she said. "As long as I hear of no credible threats, I believe we should live our Jewish lives."

Several Palestinian Americans interviewed Friday in a Brooklyn neighborhood with a large Arab population said the atmosphere has been tense in the last week.

Jumana Alkaram said she has not been personally threatened but that: "I know if I was to demonstrate my heritage or the Palestinian flag there would be some type of threat. Because the majority has the support of Israel and don't have the full legit story about what's happening in Gaza."

In New York City, a Palestinian restaurant, Ayat, was forced to disconnect its phone after receiving "nonstop" threatening voicemails, according to co-owner, Abdul Elenani. The storefront features a mural of a crying Palestinian and its menu includes calls to "end the occupation." On Friday, a man entered the dining room shouting "terrorist" at the people behind the counter, Elenani said.

Still, the hostile reception was overshadowed by the support he has received from his neighbors, many of whom are Jewish and share his views about minimizing civilian deaths, he said.

"In New York, we all live together, we work together, we grow together," Elenani said. "And we all want this violence to stop."

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Ramer reported from Concord, New Hampshire. Associated Press writers Joey Cappelletti in Dearborn, Michigan; Deepa Bharath in Los Angeles; Jake Offenhartz, Noreen Nasir and Ayesha Mir and in New York; Marc Levy in Harrisburg, Pennsylvania; and Jim Salter in St. Louis, contributed to this report.