In addition to local and state police, the federal Alcohol, Tobacco, Firearms and Explosives (ATF) was also on the scene, according to its official twitter account.
http://www.nola.com/crime/index.ssf/2015/05/bikers_shooting_in_wacos_twin.html
So, yes, BATF was there. What we do not know is how they were deployed and what they did. WE do know (per Chief Brent Stroman) that Waco PD were sitting in their vehicles when the first shots were fired. He also stated that HIS men fired 12 rounds.
I have seen no comment from BATF regarding their positioning or engagement.