[ gunfire ] >> he's are egyptian troops shooting into a mosque where they say snipers were firing at them. hundreds of protesters ral nid that mosque and demanding for the fourth day the return of ousted president mohamed morsi. security forces did not let them stay there, however. right now it's after 11:00 p.m. in cairo and our frederick pleitgen is there. frederick, start talking about what happened at that mosque today? i'm assuming the situation is calm and everyone disbursed from there? >> reporter: well, everyone's been disbursed and a lot of people taken into custody, pamela. for about 24 hours that mosque was under siege from egyptian security forces and from egyptian swims sort a vigilante militia fighting on the side of the egyptian government. of course, those inside the mosque were supporters of the ousted president mohamed morsi, and they had gone inside that mosque after a protest had ended in violent clashes. the mosque itself actually for a while was being used as a