. >> reporter: three more people following days of raids: yassine a, mohammed b, and aboubaker o, allused of participating in terrorist activites. meanwhile, a man arrested at this apartment named as faycal c when he was charged with terrorist offenses has been released. police say they didn't have enough evidence to hold him. almost a week after najim laachraoui and brahim el- bakraoui attacked airport, the memorials to those they killed remained outside. there is a wish to get this place open again soon but with additional security. tomorrow 800 airport staff will be asked to check in as if they were passengers in order to test the efficiency of the new system. >> woodruff: this evening, an all-faith service was held at the brussels cathedral in tribute to the victims of the attacks. >> ifill: and in syria, government forces began combing palmyra for mines and bombs left by islamic state militants. the army captured the ancient city yesterday, clearing the way to advance toward militant strongholds in the east. but during their 10-month occupation, isis fighters destroyed some of th