Mirza Husayn 'Ali (Baha'u'llah) [then] devised a new stratagem. A number of letters were written in different handwritings by Aka Mirza Aka Jan, Mushkin Qalam, Abbas Effendi, and other partisans of Mirza Husayn 'Ali to sundry Turkish statesmen and officials to the following effect:- "About thirty thousand of us Babis are concealed in disguise in and around Constantinople, and in a short while we shall arise. We shall first capture Constantinople, and, if Sultan Abdu'l-Aziz and his ministers do not believe [in our religion], we shall depose and dismiss them from their rule and administration. And our King is Mirza Yahya Subh-i-Ezel." These letters were left by night at the Sultan's palace and the houses of different ministers by Mushkin Qalam and other partisans of Mirza Husayn 'Ali resident in Constantinople. When next day these letters were discovered, the Turkish Government, which had treated the Babis with kindness, and afforded them shelter and hospitality, was naturally greatly incensed. The letters were forthwith laid before the Persian Ambassador, and, at a joint assembly of Turkish and Persian officials, it was decided to exile the Babi chiefs to some remote island or fortress on the coast.
-- E.G. Browne, A Travellers Narrative Written to Illustrate the Episode of the Bab, vol. 2, note. W, pp. 356-71