Ben Hassin, 21, has been under arrest since June 2015 in the Arab country for the murder of a taxi driver, who he shot in self-defense. He is the son of an Israeli father and a mother who has lived in Canada for 30 years.

The money, which reportedly would be paid as blood money to the family of the dead man, was raised on a crowdfunding website by the Zaka search and rescue organization.

Zaka said in a statement issued on Wednesday that the donated money has been held in escrow for the last two weeks “until the Zaka attorneys are satisfied that the money will be transferred through legal channels and reach its intended target. This due diligence is essential for an organization that insists on financial transparency.”

The statement said that the Hassin family has only provided details of private bank accounts, or private organizations for Zaka to send the money. Zaka said it has not been able to verify that a ransom deal exists.

Zaka also said that it is in regular contact with “reputable bodies” in the Islamic country where Ben Hassin is being held, which” are working to try and free Ben Hassin or ensure a lighter sentence.” Zaka said that a personal visit had been made to him in prison, and it was reported that he is “in good health.”

According to his father, Ilan, Ben Hassin went to visit his grandparents in the unnamed Arab country, where they still live, and while there decided to enlist in the fight against ISIS with a local militia. The cab driver heard Ben Hassin speaking Hebrew on his cell phone during a ride when he was on a furlough, and threatened to kill him for being Jewish and Israeli. Ben Hassin then killed the cabbie in self-defense. The father also said his son told him he has been tortured in prison.

Ilan Hassin told Israel Hayom in an interview published on Wednesday that the family of the cabbie is tired of waiting for the ransom money and has asked a judge to sentence his son next Friday. His son faces 25 years in prison or a death sentence.

“We were drawn into this story in good faith by the Israel Foreign Ministry and the Hassin family, as a humanitarian organization whose mission is to save those who can be saved,” Zaka Chairman Yehuda Meshi-Zahav said in the statement. “Our donors trust Zaka to work only through legal and transparent channels to carry out its mission, and therefore we refuse to hand over their money without being 100 percent satisfied that it will be used for its stated purpose. It pains us that that Zaka’s reputation and willingness to help in humanitarian issues has been exploited.” He added that the money would be returned to the donors if no proper channel is found to deliver the money.