More than 50 police officers were injured , including two critically , according to the Interior Ministry , in clashes with demonstrators in Siliana " North West " , which saw yesterday a general strike and a demonstration to mark the first anniversary of the police repression mass protests in the region. The Interior Ministry said in a statement that " a group of delinquents after the end of the demonstration tried to break into the security directorate in Siliana ." She said too , " attacks affected public and private property , where the office of the mayor of Siliana station and road transport of sabotage , as well as some shops. riots Continued to nine o'clock at night , injuring more than 50 component damage of varying severity , including fractures ," adding that injuring two of them critically .