The selling pressure intensified, causing key indices to sink into the red by the end of the morning session. At the mid-session break, the VN-Index hovered near the reference level, settling at 1,639.45 points; while the HNX-Index stood at 282.49 points, a decline of 0.93%. The number of declining stocks is gradually gaining the upper hand, with 540 losers versus 207 gainers.