According to a bulletin titled, ISIS Interest on the US Southwest Border,  released by the Texas Department of Public Safety, social media chatter shows ISIS is looking at using the Mexico-US border as an entry point into the US.

A review of ISIS social media messaging during the week ending August 26 shows that militants are expressing an increased interest in the notion that they could clandestinely infiltrate the southwest border of US, for terror attack. Social media account holders believed to be ISIS militants and propagandists have called for unspecified border operations, or they have sought to raise awareness that illegal entry through Mexico is a viable option. The identities of persons operating these accounts cannot be independently verified; however the accounts were selected for monitoring based on several indications that they have been used by actual ISIS militants for propaganda purposes and collectively reach tens of thousands of followers. One account was verified as belonging to an individual located in Mosul, Iraq…This Twitter account holder, who is the administrator of an ISIS propaganda trading group, stated that the time was right for such an action because ‘the US-Mexican border is now open large numbers of people crossing.