On 27 December 1979, 700 Soviet troops dressed in Afghan uniforms, including KGB and GRU special forces officers from the "Alpha Group" and "Zenith Group", occupied major governmental, military and media buildings in Kabul, including their primary target, the Tajbeg Palace. The operation began at 19:00, when the KGB-led Soviet "Zenith Group" destroyed Kabul's communications hub, paralyzing Afghan military command. At 19:15, the assault on Tajbeg Palace began; as planned, General Secretary Hafizullah Amin was killed. Simultaneously, other objectives were occupied (e.g., the Ministry of Interior at 19:15). The operation was fully complete by the morning of 28 December 1979.