How a Muslim Can Attack on a holy Mosque???

Almost whole world says, that muslims are terrorist and they are taking part in terrorism. As recently india blame that muslims are involve in mumbai terror attack before blaming they should understand that muslims are also suffer from the same situation and many innocent muslims have been died in these terrorist attacks.If muslims are involved in terrrorism then who are killing the muslims.The recent suicide blast in peshawer in mosque at friday prayer in which 48 muslims killed and 170 injured that happend when the prayer began boomber blew himself up.It was the horrific scene with human limbs scatterrred all around.Blood soaked caps,shirts and shoes lay around the debris of the mosque.Islam give the lesson of peace to the muslims,islam does not support terrorism under any circumstances. Terrorism goes against every principle in Islam.If muslims are terrorist why they will kill thier brothers in mosques which is the place of muslims worship.They cannot be muslims, they should understand, who blames the muslims.