The Dow Jones Industrial Average ( ^DJI ) sinks by over 300 points at the get-go after Thursday's market open, the Nasdaq Composite ( ^IXIC ) and the S&P 500 ( ^GSPC ) are also slipping lower.

The Morning Brief's Brad Smith and Seana Smith monitor the market action following the opening bell, including Treasury yield ( ^TYX , ^TNX , ^FVX ) movements on the latest GDP (Gross Domestic Product) print . Yahoo Finance Senior Markets Reporter Jared Blikre compares the weekly average so far of the market indexes.

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

This post was written by Luke Carberry Mogan .