NEW : Many died after falling from bleachers inside the stadium , while others suffocated . Egypt may issue a state of emergency if the violence continues , a minister says . At least 30 people are killed in clashes near a Port Said prison , officials told state news . The violence erupts after 21 are sentenced to death for their involvement in a deadly soccer riot . Political unrest has also played a role in a recent violence , including seven deaths Friday .
NEW : Egypt may issue a state of emergency if the violence continues , a minister says . At least 30 people are killed in clashes near a Port Said prison , officials told state news . The violence erupts after 21 are sentenced to death for their involvement in a deadly soccer riot . Political unrest has also played a role in a recent violence , including seven deaths Friday .