DALLAS (AP) — The gunman accused of opening fire at a Dallas home improvement store — killing one police officer and critically injuring two others — was initially detained because he was acting suspiciously and may have tried to steal from the store, an arrest warrant revealed Wednesday. An off-duty officer who was working a part-time job at the Home Depot store in the north of the city learned Armando Luis Juarez, 29, had an outstanding felony warrant after he was detained by store officials for suspected shoplifting, according to the arrest warrant. Two on-duty officers, Rogelio Santander and Crystal Almeida, were called to the store and, along with a Home Depot loss-prevention officer, were speaking with Juarez in an office.Read more on NewsOK.com