DALLAS (AP) — Texas Gov. Greg Abbott called Monday for the help of big tech platforms in the wake of an El Paso mass shooting that authorities say was carried out by a gunman who posted a racist screed online before killing 22 people at a Walmart.

It's unclear what the invited companies, which include Google, Facebook and Twitter, will offer or say in the aftermath of the tragedy. None addressed questions about their role after Abbott announced the tech giants will join the FBI and state lawmakers this week in Austin to discuss the El Paso shooting and how to prevent future attacks.

Authoritie...