People standing behind a police cordon look towards Lindt cafe in Martin Place, where hostages are being held, in central Sydney December 15, 2014. Dozens of hostages were trapped inside the central Sydney cafe on Monday, with local television showing some being forced to hold up a black flag with white Arabic writing in the window, raising fears of an attack linked to Islamic militants. REUTERS/David Gray (AUSTRALIA - Tags: CRIME LAW CIVIL UNREST)