Another Muslim-on-Muslim attack in Pakistan

Pakistan in its continuous downward spiral into an Iraq-esqe Shai-Sunny tragedy, exploded again in Peshawar about 10 minutes before iftar, the time for breaking the daily fast during the holy Islamic month of Ramadan, killing Seven people and wounding dozens more.

Why does Muslims kill Muslims in the name of Islam? Are some Muslims less Islamic than others? Or Islam makes people so violent that when they don't find enough non-Muslims to kill, say in Pakistan and Iraq and Saudi Arabia, they start killing each other?

Islam a 'Religion of Peace' or a 'Religion of Blood-thirsty Retards'!