At least eight people were killed and seven others injured in a shooting at an outlet mall in Allen, Texas. Among the dead are three children, including two sisters who were in elementary school. The shooter was killed by police and his social media posts reveal an obsession with Nazis and weapons. Joshua Barnwell was shopping at the mall with his friend when he heard the gunfire. Barnwell describes the horrific scene to Anderson Cooper and shares how he tried to help save some of the victims.

Plus, a source tells CNN that more than 150,000 migrants are currently waiting in Northern Mexico ahead of Title 42 expiring later this week. CNN Correspondent David Culver joins AC360 from the U.S.-Mexican border where some migrants are so desperate to escape their home countries, they risk their lives and ride on top of freight trains.

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