Why were these cases tried in a military court?

Pakistan Today reports that the execution of three civilians who were sentenced to death by a Pakistani military court has been stayed by the Supreme Court. But why were these cases tried by such a court in the first place?

"Muhammad Liaqat was allegedly involved in a fatal attack on a journalist, while Sabir Shah and Shafaqat were sentenced to death over the murder of Advocate Arshad Ali in Lahore."

Human rights jurisprudence strongly disfavors the trial of civilians by military courts.