At today's Angelus:

Dear brothers and sisters,

The news reports coming from Iraq leave us in dismay and disbelief: thousands of people, including many Christians, driven from their homes in a brutal manner; children dying of thirst and hunger in their flight; women taken and carried off; violence every kind; destruction of historical, cultural and religious patrimonies. All this gravely offends God and humanity. Hatred is not to be carried in the name of God! War is not to be waged in the name of God!

I thank those who, with courage, are bringing succour to these brothers and sisters, and I am confident that an effective political solution on both the international and the local levels may be found to stop these crimes and re-establish the [rule of] law. In order better to ensure those dear suffering populations of my closeness to them, I have named [Prefect of the Congregation for the Evangelisation of Peoples] Cardinal Fernando Filoni as my Personal Envoy in Iraq, who shall depart from Rome tomorrow [Monday].

Update:

The Vatican released today (August 13th) a letter that Pope Francis sent to the Secretary General of the United Nations. It says in part:

I write to you, Mr Secretary-General, and place before you the tears, the suffering and the heartfelt cries of despair of Christians and other religious minorities of the beloved land of Iraq. In renewing my urgent appeal to the international community to take action to end the humanitarian tragedy now underway, I encourage all the competent organs of the United Nations, in particular those responsible for security, peace, humanitarian law and assistance to refugees, to continue their efforts in accordance with the Preamble and relevant Articles of the United Nations Charter.