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Mrs. Darshan-Leitner said she is hopeful Mr. Shaya will appear, only because she hasn’t heard otherwise.

“The assumption is that he’s coming,” she said, but she acknowledged that nothing was certain.

Mr. Netanyahu’s office and the Israeli Justice Ministry declined comment on the case. Dani Arditi, director of the counterterrorism bureau at the time of the meetings with the Chinese, and Mr. Shaya also refused to comment.

Mr. Netanyahu has fashioned himself as an expert on fighting terrorism for his entire political career, and signs of official Israeli involvement in the case are everywhere.

The claims against the bank include detailed listings of account numbers, dates and precise sums of money that were transferred over several years — information that would almost certainly require professional intelligence work to obtain.

In addition, another former Israeli security official in the prime minister’s office, Shlomo Matalon, submitted a sworn statement in 2009 outlining some of the transfers and attesting that the Israelis had warned Chinese officials about the transactions. Despite such warnings, he said the bank continued to carry out transfers for Islamic Jihad and Hamas.

“The Israeli government asked us through our lawyers to bring this case and provided relevant evidence,” Wultz’s father, Yekutiel, who was wounded in the 2006 bombing, said in a statement.

“We believe it is critically important to stop the flow of money to terrorists to prevent attacks like the one that killed Daniel and are grateful for the support we have received from many people in Israel, the United States and around the world who all want to see commitments honored, justice done and a safer, more peaceful world,” said Mr. Wultz, who lives in Florida.

Adding to the high profile of the case, Daniel Wultz’s mother, Sheryl, is a cousin of U.S. House Majority Leader Eric Cantor, Virginian Republican. His office said he is “not involved” in the case.

Mrs. Darshan-Leitner, the lawyer representing the other families, said she plans to subpoena Stuart Levey, a former U.S. Treasury Department official, as a witness who could help the case, especially if Mr. Shaya doesn’t testify.

She said she believes Mr. Levey, who monitored the financial dealings of terrorist groups, has evidence showing Bank of China accounts were used by Hamas to channel funds to operatives in Gaza. Mr. Levey’s current employer, HSBC Holdings PLC, declined comment and would not make him available for an interview.

The Bank of China declined comment. But in Beijing, Chinese Foreign Ministry spokesman Hong Lei said China opposes “all forms of terrorism” and takes a “proactive role in global counterterrorism cooperation.” He said China also takes safeguards “to prevent any financial institutions from supporting terrorist activities.”

China has never labeled Hamas or Islamic Jihad terrorist groups.

Israeli media reports have said Mr. Netanyahu began to have misgivings about the case last spring, shortly before leading a trade delegation to China. The Yediot Ahronot daily has said the Chinese threatened to cancel the visit if Mr. Netanyahu allowed Mr. Shaya to testify.

China has a history of using its considerable economic might to voice displeasure with other countries. For three years, Beijing has frozen relations with Norway since a committee appointed by the Norwegian Parliament awarded the 2010 Nobel Peace Prize to an imprisoned Chinese dissident. Diplomatic ties have been gutted, meetings canceled and economic ties hamstrung.

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