According to Israeli CNN journalist Barak Ravid

On Sunday, Hamas announced that it was rejecting an invitation from the US, Qatar and Egypt to a final round of talks on the Gaza hostages and a ceasefire scheduled for Thursday.
In simple terms: Hamas has rejected peace talks, and now Israel fears that Iran will launch a direct attack within the next few days. Which explains today's market plunge.
Source -

According to Israeli CNN journalist Barak Ravid

On Sunday, Hamas announced that it was rejecting an invitation from the US, Qatar and Egypt to a final round of talks on the Gaza hostages and a ceasefire scheduled for Thursday.
In simple terms: Hamas has rejected peace talks, and now Israel fears that Iran will launch a direct attack within the next few days. Which explains today's market plunge.
Source - https://x.com/BarakRavid/status/1822713576953405842