An explosion in Cairo killed four people on Friday (January 24) and wounded dozens.<br/> <br />A group of supporters of General Abdel Fattah al-Sisi gathered at the blast site.<br/> <br />This man said he heard the blast and ran to the scene.<br/> <br />SOUNDBITE) (Arabic) UNIDENTIFIED EYEWITNESS, SAYING:<br/> <br />"Whoever did this must be hanged. I swear, the government's leniency won't do any good in this situation."<br/> <br />Three of the casualties were policemen.<br/> <br />The wounded were rushed to hospital for treatment.<br/> <br />The assault on the Cairo Security Directorate raises concerns that an Islamist insurgency is gathering steam.<br/> <br />It comes a day before the third anniversary of an uprising that toppled Hosni Mubarak.
