In total, the national JCC has tallied calls to 53 JCCs in 26 states in the last two months. On Monday, the calls came in to a wide range of locations: Albuquerque, Birmingham, two locations in Buffalo, Chicago, Cleveland, Houston, Milwaukee, Nashville, St. Paul, Tampa, and Tulsa, according to a list compiled by a national JCC spokesperson. “We are concerned about the anti-Semitism behind these threats, and the repetition of threats intended to interfere with day-to-day life,” said David Posner, the director of strategic performance at the JCC Association of North America, in an emailed statement.

The calls seem to be connected: They are coordinated in timing and message, and often contain generic promises of violence. In one recording, posted by the Jewish Telegraphic Agency, the caller threatens, “In a short time, a large number of Jews are going to be slaughtered. Their heads are going to ... blown off from the shrapnel.” Sax would not share exact details about the calls Nashville has been receiving, but confirmed that theirs have been similar to those recorded elsewhere.

On Monday night, President Trump’s daughter, Ivanka, condemned the attacks on Twitter.

America is a nation built on the principle of religious tolerance. We must protect our houses of worship & religious centers. #JCC — Ivanka Trump (@IvankaTrump) February 20, 2017

It’s significant that she was the person who made a statement: Trump and her family are Jewish, so they arguably have a personal connection to the attacks. On Tuesday morning, the president condemned discrimination against Jews in a conversation with reporters: “Anti-Semitism is horrible and it’s going to stop. It has to stop,” he said. Previously, the president declined to explicitly condemn recent instances of anti-Semitic threats and violence, including the calls to JCCs. At a press conference on Thursday, an Orthodox Jewish reporter asked him about “an uptick in anti-Semitism and how the government is planning to take care of it.” Trump asked him to sit down, saying that it was “not a fair question”—“I am the least anti-Semitic person that you’ve ever seen in your entire life,” Trump added.

“He was given a softball question and an opportunity to denounce anti-Semitism, and he failed,” said Dave Simon, the executive director of the JCC in Albuquerque, which received its second threatening call on Monday. “That’s deeply disturbing to me, because he’s president of all Americans, and he needs to stand up for our principles—the principles of America.”

The dominant feeling in the Albuquerque Jewish community right now is anger, Simon said. “They’re mostly pissed off at the morons who are doing this. Our JCC is known and loved in the community, and people are angry that it’s being targeted and being disrupted.” Sax said something similar about the frustrations in Nashville: “It keeps us from doing what we need to be doing every day. We’re already very busy,” she said. “It keeps us from doing the other work we had planned to do.”