Table 3 Timeline of the EMS response to the Utøya island shooting (estimated points of time in italics).

Reports of shooting at Utøya island reaches Buskerud EMCC

First ambulance units dispatched by Buskerud EMCC

First EMS unit arrives near Utøya island

A major incident declared in VVE.

VVE hospitals Drammen and Ringerike activate their major incident plan (Asker Bærum already activated their major incident plan following the Oslo bombing)

Utvika quay briefly declared secure by local police

First victims arrive on the mainland shores east of Utøya island

First HEMS unit arrives at deployment site south of Utøya island

Last HEMS unit arrives at deployment site south of Utøya island

First organised casualty-clearing station established at Utvika quay

Second casualty-clearing station established at Storøya

First EMS personnel arrive at Utøya island

First casualty-clearing station closed

First patient from Utøya island arrives at Oslo University Hospital Ullevål

Last patient from Utøya island arrives at Oslo University Hospital Ullevål

Last HEMS unit leaves secondary casualty-clearing station

Second casualty-clearing station closed