Dozens of Palestinians who lost relatives in an Israeli military offensive in Gaza three years ago have been forced to put their compensation claims on hold, saying Israel has placed near-impossible barriers to proceeding with their cases.

Israeli restrictions prevent Gazans from entering Israel to testify, undergo medical exams or meet with their lawyers. But the biggest obstacle, the victims say, are steep court fees that can reach tens of thousands of dollars.

"The victim must pay for justice," said Gaza resident Mohammed Abdel-Dayim, whose son and three nephews were killed during a military assault. "Israel should be ashamed."

Israel says the fees prevent frivolous lawsuits. They say they are imposed on many foreigners — not just Palestinians — because they don't have local assets that the state could seize to cover legal fees and other court costs.

But Palestinians say the costs are part of a strategy to protect Israeli soldiers. If the fees aren't reduced, lawyers representing Palestinians say they will have to drop most cases.

Abdel-Dayim is suing Israel over the deaths of four relatives: His son was a volunteer medic who died when Israeli tank fire struck the ambulance he was driving. Three nephews were killed the next day when Israeli shelling struck a mourning tent where the family was grieving.

An Israeli court asked Abdel-Dayim to post $22,000 in court fees, or just over $5,000 per victim. His annual income is under $6,000.

About 1,000 Gazans have prepared cases seeking compensation, mostly alleging wrongful deaths during Israel's offensive in the territory, according to their lawyers.

Some 1,400 Gazans were killed during the three-week Israeli operation, including hundreds of civilians. Israel launched the offensive in December 2008 in response to heavy Palestinian rocket fire. Thirteen Israelis also died in the fighting.

Israel says Gaza's Hamas rulers are responsible for the civilian casualties, claiming the militant group endangered civilians by firing rockets from near schools and residential areas.

In civil suits in Israel, the losing party must pay legal fees and court costs of the winning side. Because foreign nationals could bolt without paying, Israeli courts often demand a security deposit. The money is returned to plaintiffs who win their cases.

The sum of the guarantee is left to individual judges.

For example, in July, Judge Nehama Munitz of the District Court in the northern city of Nazareth demanded a $5,500 deposit from each of 42 Gazan plaintiffs in a case involving the bombing of the Abdel-Dayim mourning tent, according to legal documents. Mohammed Abdel-Dayim's share was $22,000.

She said the fees are justified by the expensive and time-consuming investigative process, and dismissed claims of a financial barrier.

"The plaintiffs did not prove that they are unable to afford the expense of the court guarantee, and/or did not claim this in their brief," she wrote in a court document obtained by The Associated Press.

Tameem Younis, a lawyer representing the families, is now appealing. If the fees aren't reduced, "we will have to cancel the claims," he said.

Iyad Alami of the Gaza-based Palestinian Center for Human Rights, which takes on many cases, said they have raised money for some of the most important petitions, including a planned case where some two dozen members of the Samouni clan were killed after fleeing to what they thought was a safe house.

Nitzan Eyal, a spokeswoman for Israel's courts system, said the fees are set based on the chances of success.

"The lower the chances of the claim, the higher the justification for charging the plaintiff a court deposit to ensure the legal expenses of the defendant," she said.

Israelis, in contrast, typically don't have to pay up front because the courts can put liens on their properties. Likewise, families of victims from friendly nations often don't pay.

Hussein Abu Hussein, attorney for the American parents of Rachel Corrie, who was killed in Gaza in 2003 when she was run over by a military bulldozer, did not pay a deposit in their civil suit against Israel. He said it was waived because the U.S. and Israel enforce each others' court rulings.

Israel and the Palestinians have no such understanding.

Michael Karayanni, a law professor at Israel's Hebrew University, said the legal fees appeared excessive, given the impoverished circumstances of many Gazans. Some 40 percent of Gaza's 1.5 million residents live on less than $2 a day, according to U.N. figures.