White powder found at Dartford sorting office

White powder found at Dartford sorting office; ITN ENGLAND: Kent: Dartford: EXT GV Royal Mail sorting office where white powder was discovered in a package leading to employees being quarantined PULL OUT to show TGV rescue services in f/g MS Policeman and BV policewoman LS Three people in chemical suits along PAN Craig Sackett (Union official) interview SOT - Some of the staff in the building should have finished work by now, some are about to start and may not be aware of the situation / As far as we know they're ok, but we don't know if it's a suspect package or what / We've heard nothing from people inside the building GV Row of stationary fire engines and police vehicles SIDE GV 'Incident Response Unit' truck TGV BV Police watching from road PULL OUT GV Group of firefighters i/c TGV People in chemical suits along towards barrier GV Fire engine and police car outside sorting office