Islamic State claims to have beheaded US hostage Kassig

UN: IS denies food aid to hundreds of thousands

Obama to send 1,500 more troops to Iraq as campaign expands

150 Iraqi tribesmen opposed to Islamic State found in mass grave

Kurdish convoy heads to Syria to take on Islamic State

US-led airstrikes kill 553 militants and 32 civilians

FBI: US girls may have tried to join jihadis

Islamic State training pilots to fly in three jets

Islamic State video shows second British hostage beheaded

PM: Australian aircraft to support US-led air strikes in Iraq

Israel PM: Iranian president sheds 'crocodile tears'

UN chief vows to back Iraq in fighting Islamic State

FBI: Militant in Syria beheading videos identified

Fact: States line up behind US in fight against Islamic State

Lebanon detains 450 suspected militants in Syria border crackdown