CAIRO, — Hundreds of protesters pelted the security headquarters in the city of Suez with rocks on Wednesday, angered by a court's decision to uphold the release of seven policemen facing trials for allegedly killing protesters during Egypt's uprising.

Riots and protests have been escalating recently over what many see as the reluctance of the military rulers to prosecute police and former regime officials for the killing of nearly 900 protesters during the uprising earlier this year.

Ahmed el-Ganadi, the father of a protester killed in Suez during the revolt, said hundreds of residents marched toward the government building housing the courts and security headquarters to protest the court decision.

"The courts are corrupt. They are complicit in denying us justice," el-Ganadi said. "We will no longer wait for a court decision to get our retribution."

Suez, at the southern tip of the strategic Suez Canal, was the scene of some of the most dramatic confrontations between police and protesters during the 18-day uprising that ousted President Hosni Mubarak in February.

The court in Suez rejected an appeal of the decision in a Cairo court on Monday to release on bail seven policemen facing trial for the killings of 17 protesters in Suez.

The angry relatives stormed the Cairo courtroom after the initial ruling on Monday, while others blocked a major highway linking Cairo to Suez for hours. Hundreds in Suez have been holding a sit-in since Monday at one of the city's main squares.

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Lawyers said the courts have consistently denied a request to add more policemen to the case.

"A sit-in until we get retribution," read one of the signs raised by the protesters at the sit-in.

There are already calls for large protests in Egypt this week demanding fair trials and retribution, as well as measures to purge former regime officials from political and economic life.

Only one policeman has been convicted in more than a dozen court cases over the deaths of at least 846 people killed in the government crackdown on protesters. He was tried in absentia.