Stock market today, June 18 -- Indian stock markets commenced trading with a downward trend on Wednesday as geopolitical tensions between Israel and Iran extended into the sixth day, with concerns regarding potential US involvement heightening investor anxiety.

The Nifty 50 began at 24,797.15, dipping by 65.05 points or 0.26%, while the BSE Sensex dropped 269 points to open at 81,313.9, reflecting a decline of 0.33%.

Geopolitical strains intensified when US President Donald Trump demanded an "unconditional surrender" from the Iranian government, a demand that Iran has dismissed. Israel, reportedly achieving several of its military goals rapidly, is believed to have air superiority over Iran.

Nonetheless, Iran's missile capabilities sti...