A gunman is holding up to 30 people hostage at a cafe in Sydney.
A black Islamic flag has been displayed in the window of the Lindt Café and five people have been seen running from the building.
It is unclear how many people still remain inside.
One hostage who escaped is being treated in hospital.
Hundreds of armed police have sealed off the area. The siege has been going for 13 hours, since 9am Australian time.
Police officers say they've now made contact with the gunman.
Australia's Prime Minister Tony Abbott gave a statement regarding the situation, saying that it may be politically motivated but nothing is certain at the moment.
London Live reporter Luke Blackall gives the latest on the situation and discusses the possible motives behind the siege.