Developing:

Hostage situation erupts in Sydney cafe, Australian prime minister says it may be “politically motivated” http://t.co/439C1MkRWf

— The Associated Press (@AP) December 15, 2014

BREAKING: Flag in #SydneySiege window confirmed to be that of Jabah Al-Nusra, says Islamic terror expert on 7News pic.twitter.com/pvZLwrU5GA

— Kristina Dei (@2kdei) December 15, 2014

Several hostages taken at the Lindt cafe in Sydney. Separately, there were reports of an evacuation at the Sydney Opera House.