Dutch singer Lenny Kuhr, who was heckled during a show on at the weekend over her links with Israel, has said she will continue with her tour despite the threats.

Kuhr’s next performance, at the Geert Teis theatre in Stadskanaal, is planned for Tuesday but ticket sales have been suspended because theatre director Riëtte Kruize is contemplating extra security measures following “several nasty phone calls”. It is not clear if the show will go ahead or not.

Kuhr, who became Jewish on her marriage to her first husband, has spoken out against the Hamas attacks on Israel several times. On Instagram last year, she said the “approved of the Israeli military operation” but that “violence must be short and minimal and not come from hate.”

Kuhr has several grandchildren who are army conscripts, one of whom was wounded during the attack on October 7.

The singer has made a formal police complaint about threatening behaviour, slander and libel following Saturday’s disruption. Two of the four activists, all of whom belong to the Campaign Group Palestine Action NL, have already been questioned by police, the AD reported on Monday.

Rob Frank, manager and husband of the singer, said the demonstration did not come as a surprise. “Antisemitism has been growing and it is affecting us too. Because we are Jewish we are getting all kinds of hate mail and messages saying Lenny’s grandchildren should die. I don’t think this was an incident,” he told the Volkskrant.

Antisemitism monitor Nationaal Coördinator Antisemitismebestrijding said in a reaction on social media that “apparently every Dutch Jew must proclaim against Israel’s policy or they’re a terrorist and fair game to be called names and prevented from doing their job”. “That is a form of antisemitism,” spokesman for the monitor Eddo Verdoner said on social media.

The Campaign Group Palestine Action NL has said cultural events are part of the “boycott of Israel at every level” including the Eurovision Song Festival, which Lenny Kuhr won in 1969.

Activists also staged a demonstration at a film venue in Maastricht where Israeli films were shown on Sunday and interrupted performances of the Jerusalem Quartet in The Hague and Amsterdam.