Joondalup Lakeside Shops Evacuated 08.11.2018 Western Australia

Originally i thought it was a test siren, but no please ignore was announced. I left Woolworths but the sirens stopped just after. this so i waited in the main mall which is about where the video starts. The sirens started again and i then waited outside away from the shops but many not knowing why the sirens stood right outside the doors. we were evacuated for about 20 mins. i dont know why the evacuation.