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image captionInsp Ben Dawson said he could not get through to his equivalent at Greater Manchester Police
A police commander who took control after the Manchester Arena attack has described his frustration at being unable to contact emergency services.
British Transport Police (BTP) Insp Ben Dawson was based in a London control room on the night of the explosion.
Insp Dawson said the control room could not contact other police and ambulance services and his team had to ring 999 and wait in a queue with the public.
He told an inquiry the first hour after the bombing was "absolute chaos".