The SET index opened the morning session down more than 16 points, tracking global market trends amid heightened concerns over the Middle East situation, which pushed oil prices back up to touch 100 US dollars per barrel and lifted US bond yields, weighing on risk assets. At 9.59 a.m., the index stood at 1,624.85 points, a drop of 16.18 points or 0.99 percent. Mr. Soraphol Weerametheekul, Assistant Managing Director and Head of Investment Strategy at Kasikorn Securities, said selling pressure on large-cap stocks was also pressured by the weakening baht, with resistance seen at 1,640 points and support at 1,615 points.