The mother of Joshua Jahn — the sniper who opened fire on a Dallas ICE facility Wednesday — had posted a series of anti-gun rants on Facebook aimed at Republican lawmakers just a few years ago.

Joshua Jahn, 29, opened fire from a rooftop on a bus carrying migrants into a Dallas ICE facility under federal escort before taking his own life.

Three detainees shot, including at least one fatally, at Dallas ICE facility, officials announce. The suspected attacked, identified by sources to Fox News as 29-year-old Joshua Jahn, died after turning the gun on himself,

Joshua Jahn, 29, identified as the shooter at the Dallas ICE detention center, killed at least two inmates and wounded one before turning the gun on himself.

Joshua Jahn acted alone and planned the ICE facility shooting in Dallas with significant detail. He left handwritten notes expressing hatred for the federal government and a desire to terrorize ICE employees,