Islamic State forces reportedly have surrounded a Turkish exclave in Syria where the grandfather of the founder of the Ottoman Empire is entombed. Turkey's Parliament is expected Thursday to authorize the deployment of troops to confront IS forces.
Melbourne raids follow a heightened terror alert earlier in September and the tabling of new security laws in Australia's parliament.
Efforts to expand the anti-Islamic State coalition include the debate in Britain's Parliament, deliberations in Denmark and Belgium, and US overtures to Turkey. US and French jets struck IS oil targets overnight in Syria.
Further airstrikes overnight were reported in northern Syria. President Obama will chair a UN Security Council meeting Wednesday to propose new resolution to curb foreign volunteers aiding Islamic State.
The Pentagon said Arab allies assisted overnight strikes in Syria. Islamic State bases were the main target, but the US said it also struck at a separate al-Qaeda affiliate suspected of plotting terror attacks on Western targets.
The video's release appears timed as a response to Gen. Martin Dempsey's testimony Tuesday to a Senate committee. He raised the possibility of sending US troops to fight Islamist militants in Iraq and Syria.