Photos posted on social media show riot police surrounding demonstrators . The clashes began after a group of protesters tried to march through the city center in an attempt to reach Tahrir Square, where they had been camped out for more than two weeks. Maintaining blockbuster growth has sometimes come at the expense of environmental protections . Opponents fear the plant would produce tons of paraxylene , a carcinogenic chemical .
Photos posted on social media show riot police surrounding demonstrators . The clashes began after a group of protesters tried to march through the city center in an attempt to reach Tahrir Square, where they had been camped out for more than two weeks. Opponents fear the plant would produce tons of paraxylene , a carcinogenic chemical .