The widows of Israeli athletes who were killed in a terrorist attack in Munich said they were "extremely worried" by reports that Jeremy Corbyn had visited the graves of those responsible.
Ankie Spitzer and Ilana Romano, whose husbands Andre and Yossef were among the eleven athletes killed and killed in the 1972 Munich Olympics, warned the Labor leader that he was "being condemned by the company they keep".
And Interior Minister Sajid Javid suggested that Mr. Corbyn, who attended a wreath-laying ceremony near the graves, give up the subject.
The Daily Mail published images of the Labor leader who held a wreath in 2014 at the Palestinian Martyrs' Cemetery in Tunisia while visiting the North African country.
Labor said that Mr. Corbyn had already made it clear that he was waiting for the victims of an Israeli air raid of 1985 on the offices of the Palestine Liberation Organization in Tunis.
But the Mail said that her own visit to the cemetery showed that the pictures were taken in front of a memorial plaque in honor of the founder of Black September, who carried out the massacre while the air raid monument was 15 meters away.
Mrs. Spitzer and Mrs. Romano told the Jewish News: "We do not remember a visit from Mr. Corbyn to the graves of our murdered fathers, sons and husbands.
"They went to the Olympics only to attend this festival of love, peace and brotherhood, but they all returned home in coffins.
"For Mr. Corbyn to honor these terrorists is the ultimate act of malice, cruelty and stupidity."
And they added: "Do not forget, Mr. Corbyn, that you are being condemned by the company you keep."
Responding to the mail story, Labor sources said Mr. Corbyn had already given a full account of his presence in the cemetery when the visit came in the headlines during the election campaign last year.
The Labor leader said last year, "I was at a Palestinian conference in Tunisia and I spoke at the Palestinian Conference and I laid a wreath to all those who died in the air strike on the Palestinian headquarters in Tunis.
"And I was accompanied by many other people who were at a conference looking for peace."
In the Morning Star at the time of the visit, Mr. Corbyn wrote that wreaths had been applied not only to the monument but also "on the graves of other Matsad agents killed in Paris in 1991" wreaths.
Mr. Javid said, "If this were the leader of another major political party, he or she would be gone now."
And the chairman of the Jewish Leadership Council, Jonathan Goldstein, told the Jewish News: "This man is not fit to be a member of parliament, let alone a national leader.
"He has spent his entire political career with conspiracy theorists, terrorists and revolutionaries trying to undo all the good things our ancestors gave their lives for, in many ways enough is enough."
The images emerged amidst ongoing controversy over the Labor Party's refusal to pass an international definition of anti-Semitism, including a list of examples of anti-Semitic behavior.
Three senior union leaders have joined Vice-President Tom Watson's demands to fully incorporate the entire text of the International Holocaust Remembrance Alliance into the new Labor Code of Conduct on Anti-Semitism.
Labor has launched a consultation with Jewish groups on the Code after four examples of criticism of the State of Israel have been omitted in the version agreed by the Party's ruling National Executive Committee.
A Labor Party spokesman said, "The Code of Conduct adopts the IHRA definition and expands and contextualizes its examples to create robust, legally sound policies that a political party can apply to disciplinary cases.
"The NEC upheld the adoption of the Code of Conduct against anti-Semitism, but in recognition of the serious concerns of resuming the development of the Code in consultation with Jewish community organizations and groups, it was better to reflect on their views."
Shadow Chancellor John McDonnell wrote in the Sunday Mirror: "Both Jeremy Corbyn and I have made it clear that racism and anti-Semitism have no place in the Labor Party.
"The Labor Party will solve all open questions in our party and support the Jewish community in the fight against anti-Semitism and racism."