All three of the major indexes (^DJI,^GSPC, ^IXIC) opened slightly lower on Wednesday, while oil prices (CL=F, BZ=F) continued to rise. Investors were rattled after Iran launched a ballistic missile attack on Israel. Israel has vowed to respond to the attack, raising concerns about tensions escalating even further.

Morning Brief Anchor Seana Smith and Yahoo Finance Markets and Data Editor Jared Blikre break down the action at the open.

For more expert insight and the latest market action, click here to watch this full episode of Morning Brief.

This post was written by Stephanie Mikulich.