The aircraft was then refuelled and took off for Dubai at 03:24. Dubai Approaching Dubai, the 737 was again denied landing permission. Overflying the Dubai airport in the early light of dawn, the hijackers and pilots saw the runway blocked with military jeeps, trucks and fire engines. Running short of fuel, Schumann radioed the tower to announce that they were going to land anyway. As they made a low pass over the airport, the vehicles were finally being removed. At 05:40 local time, the pilots made a smooth touchdown on the airport's main runway at sunrise. The plane was parked at the parking bay around 05:51, at daybreak. In Dubai, the terrorists instructed the control tower to send airport crew staffers to empty the toilet tanks, supply food, water, medicine, newspapers, and take away the rubbish. Captain Schumann was able to communicate the number of hijackers on board, specifying that there were two male and two female hijackers by dropping different types of cigarettes on the tarmac from out of the cockpit window. In an interview with journalists, this information was revealed by Dubai's Sheikh Mohammed, then Minister of Defence. The hijackers learned about this, possibly from the radio, causing an enraged Mahmud to angrily threaten Schumann's life for secretly sharing this coded message. The aircraft remained parked on the tarmac stationed at Dubai airport all throughout Saturday 15 October, during which the jetliner experienced technical snags with the electrical generator, air conditioning and auxiliary power unit breaking down. The hijackers demanded that engineers fix the plane. On the morning of Sunday 16 October, Mahmud threatened to start shooting hostages if the aircraft was not refuelled, and Dubai authorities eventually agreed to refuel the plane. In the meantime, both Hans-Jürgen Wischnewski, the West German minister responsible for handling the hijacking, and Colonel Ulrich Wegener, commander of elite German anti-terrorist squad GSG 9, had arrived in Dubai to try to persuade the government to agree to let GSG 9 commandos into Dubai to storm the aircraft. However, after permission was granted for GSG 9 commandos to storm the aircraft, SAS and GSG 9 senior operatives insisted on additional combat exercises and dry-runs on an adjacent airstrip. Reports suggest up to 45 hours of training was conducted while in Dubai (over a period of 80 hours). While Wegener was contemplating his options, the jetliner was on the move again after the hijackers