Demonstrators torched a police station in the eastern city of Suez early Thrusday over the killing of protesters in anti-Government demonstrations on Tuesday as around 600 other protesters clashed with police in the neighbouring city of Ismailia. Protesters in Suez had on Wednesday set a Government building and another police post on fire, as well as tried to burn down a local office of the ruling National Democratic Party. The fires were all put out before they engulfed the buildings, said security officials. A Reuters witness said police fled the post that was burned before the protesters hurled petrol bombs. Dozens more protesters gathered in front of the second police post on Thrusday demanding the release of their relatives who were detained in protests. Clashes erupted when protesters hurled stones at police, who responded with tear. Demonstrations, demanding social injustice and economic reforms, have raged since Tuesday across several cities, including Cairo and Suez. Officials say hundreds of people have been arrested. Protesters in Suez threw Molotov cocktails at a Government building, setting parts of it on fire, witnesses said. Others firebombed and occupied the headquarters there of the ruling National Democratic Party. In Ismailia, 600 protesters clashed with police in demonstrations across the city as the police dispersed the crowds using tear gas. Police in Cairo have already fought thousands of protesters who defied a governmental ban on Wednesday to protest against the Government, firing rubber bullets and tear gas at the crowds and dragging away demonstrators. Meanwhile, a group of hackers known as "Anonymous", which attacked Tunisian government websites this month, has warned the Egyptian Government of reprisals if it blocks Internet access for protesters. "Anonymous wants you to offer free access to uncensored media in your entire country," it said in a Facebook posting. "When you ignore this message, not only will we attack your government websites, we will also make sure that the international media see the horrid reality you impose on your people!" it said. Anonymous encouraged people to join its "Operation Egypt" and download software that would enable it to launch distributed denial of service, or DDoS, attacks. In such attacks, a large number of computers are commandeered to simultaneously visit a website, overwhelming its servers, slowing service or knocking it offline completely. Anonymous earlier this month managed to shut down the Tunisian government's official website, the national stock exchange site, and other sites during a popular uprising that led to the ousting of the country's dictator.