The shares of Bulgarian construction company Trace Group Hold [BUL:T57] traded 4.76% lower at 3.6 levs ($2.14/1.84 euro) on the Sofia bourse at the start of Monday's session after a bus crash, allegedly caused by the poor condition of a road recently repaired by a unit of the company, killed 16 and left 27 injured on Saturday.By 9:00 CET on Monday, a total of 6,308 Trace Group Hold shares had changed hands in 15 deals at a weighted average price per share of 3.6564 levs, bourse data shows.Earlier on Monday, regional development minister Nikolay Nankov told local broadcaster Nova that the government road infrastructure agency had found 22 defects on the road near the town of Svoge where the accident occurred, which was repaired by a Trace Group Hold unit in 2014.