 Bahá'í cemeteries have been desecrated and property seized and occasionally demolished, including the House of Mírzá Buzurg, Bahá'u'lláh's father.The House of the Báb in Shiraz has been destroyed twice, and is one of three sites to which Bahá'ís perform pilgrimage.The Islamic Republic has often stated that arrested Baha'is are being detained for "security issues" and are members of "an organized establishment linked to foreigners, the Zionists in particular."