UHJ : Babi martyrs not 20,000 but 2,000 to 3,000

On September 4, 2005, the Universal House of Justice wrote a letter "concerning the source of a statement about 20,000 [Babi] martyrs" given that "Some historians think the number of early Babi/Bahá'í martyrs was not 20,000, as 'Abdu'l-Bahá and Shoghi Effendi mentioned numerous times, but 2,000 to 3,000."

https://bahai-library.com/uhj_mazandarani_number_martyrs