One killed as Islamist students and police clash in Cairo CAIRO (Reuters) - One student was killed on Saturday and scores were arrested when supporters of the Muslim Brotherhood clashed with Egyptian police at the Cairo campus of Al-Azhar University, state media reported. Shaimaa Mounir, a student activist, told Reuters that the dead student was Khaled El-Haddad, a supporter of the Brotherhood that was designated this week as a terrorist organization by the state. State-run newspaper Al-Ahram said that security forces fired teargas to disperse pro-Brotherhood students who were preventing their classmates from entering university buildings to take exams. Protesters threw rocks at police and set tires on fire to counter the teargas. Al-Ahram quoted a health ministry official as saying that one student had been killed and five injured. The violence followed clashes across the country on Friday in which at least five people died. Two college buildings caught fire in Saturday's violence. State TV broadcast footage of black smoke billowing from the faculty of commerce building and said "terrorist students" had set the agriculture faculty building on fire as well. Police arrested 101 students for possession of makeshift weapons including petrol bombs, the state news agency reported. Calm had been restored, and scheduled exams had begun after the morning clashes. Al-Azhar, a respected centre of Sunni Islamic learning, has for months been the scene of protests against what the Brotherhood calls a "military coup" that deposed Islamist Mohamed Mursi as president after a year in office. Separately, a prosecutor ordered the continued detention of seven Al-Azhar students arrested during clashes on Thursday. Judicial sources said the students are being investigated on accusations of membership in a terrorist organization. The students are the first to be ordered detained by the prosecutor on accusations of belonging to a terrorist group since the Brotherhood was declared one on December 25. That move increased the penalties for dissent against the government installed after the army ousted Mursi in July following mass protests against his rule. The widening crackdown against the movement that was elected into power after the toppling of veteran leader Hosni Mubarak in 2011 has increased tension in a country suffering the worst internal strife of its modern history following Mursi's ousting. The army-backed government appears bent on clamping down on dissent ahead of a referendum next month on a new constitution, a step that will pave the way for parliamentary and presidential elections. Thousands of Brotherhood members have been arrested. More than 250 Brotherhood supporters were arrested on Friday alone using the new classification. Some officials, including Interior Minister Mohamed Ibrahim, were appointed by Mursi but sided with the army and have been key players in the security crackdown since the Islamist president's ouster. Human Rights Watch said on Saturday that the government's designation of the Brotherhood as a terrorist group was "politically driven" and intended to end all of the movement's activities. "By rushing to point the finger at the Brotherhood without investigations or evidence, the government seems motivated solely by its desire to crush a major opposition movement." said Sarah Leah Whitson of the New York-based rights group. The government has not provided evidence linking the Brotherhood to the recent attacks on security forces and state institutions. Authorities accused the Brotherhood of carrying out a suicide attack on a police station that killed 16 people on Tuesday, though it was claimed by a radical faction based in the Sinai Peninsula. An adviser to interim president Adli Mansour said in comments published on Saturday that he believed Egypt would not return to a state of emergency even if the violence continued. Authorities lifted the state of emergency in November, three months after the army enforced the measures amid the bloody turmoil that followed its overthrow of Mursi. Mustafa Hijazi told London-based Asharq al-Awsat newspaper that the designation of the Brotherhood as a terrorist group was not political. "Instead, it is the use and application of existing laws," he was quoted as saying. Under the anti-terrorism law dating back to the presidency of Mubarak, those convicted can be jailed for life. Authorities said this week that the movement's leaders could face the death sentence. Editing by Alison Williams and Alister Doyle