He declined to call it a terrorist attack , saying the investigation was still ongoing . ` NEW : Death toll in minivan explosion rises , government official says . Turkish rebels first overran the Syrian border gate at The Tabqa Dam recent months . Syrian officials have not yet commented on the cause of the blast . Meanwhile , Syrian rebels claim to have captured Turkey 's largest man-made dam .
NEW : Death toll in minivan explosion rises , government official says . Turkish rebels first overran the Syrian border gate at The Tabqa Dam recent months . Syrian officials have not yet commented on the cause of the blast . Meanwhile , Syrian rebels claim to have captured Turkey 's largest man-made dam .