Bulgarian Stock Exchange indices closed lower on Thursday, as half of the total trading turnover during the session was formed by deals in Industrial Holding Bulgaria (IHB) shares.A total of 586,125 IHB shares changed hands on Thursday, forming a turnover of some 608,000 levs ($349,000/311,000 euro). Total regulated market turnover amounted to 1.2 million levs.The blue-chip SOFIX index dropped 0.14% to 581.07 points, as First Investment Bank (Fibank) fell most among SOFIX members. Fibank ended the session 1.68% lower at 3.52 levs, hitting a two month low.Diversified group Chimimport and its unit - Central Cooperative Bank, were the other two major decliners on Thursday, losing 1.67% and 1.30%, respectively.