A New York-based human rights group says the Israeli military is fully responsible for its air strike that killed nearly 60 civilians in Lebanon, calling such attacks a "war crime."

In a statement released in Beirut Sunday, Human Rights Watch said Sunday's air strike in the village of Qana was a product of an indiscriminate bombing campaign amounting to a war crime.

The statement calls on the U.N. secretary-general to establish an International Commission of Inquiry to investigate violations of international humanitarian law during the conflict.

Meanwhile, the Organization of the Islamic Conference is preparing for an emergency meeting this week on the need for an immediate ceasefire in the Middle East and deployment of a U.N. peacekeeping force.

The O.I.C., which includes almost all of the world's Muslim-majority nations, has called members of its executive committee to a one-day session Thursday in Putrajaya, Malaysia's administrative capital.

The executive committee includes Malaysia, Saudi Arabia, Qatar, Senegal, Yemen, Turkey and Azerbaijan.  The Jakarta Post says Iran, Indonesia, Bangladesh and Pakistan and other states are likely to send high-level delegates to the meeting.

Some information for this report was provided by AFP, AP and Reuters.