It is pervasive throughout Islamic culture, including the green flag of Saudi Arabia. Jihadis have expropriated the Shahada in their own black flag.
“We don't know whether this is politically motivated, although obviously there are some indications that it could be,” Prime Minister Tony Abbott told reporters in the nation's capital, Canberra.
“We have to appreciate that even in a society such as ours, there are people who would wish to do us harm.”
Heavily armed officers were lined up outside the cafe, and a man with a backpack inside the cafe could be seen walking back and forth in front of the glass doors.