[article] [more thorough article thanks to Newscience] MOSCOW (Reuters) - A Boeing 737 airliner crashed on landing in the Russian city of Kazan on Sunday, killing all 50 people on board, the Emergencies Ministry said. The flight from Moscow's Domodedovo airport was making a second attempt to land and exploded when it hit the runway, killing all 44 passengers and six crew on board. Flight U363 was operated by the regional Tatarstan airline, a ministry spokeswoman said. Firefighters extinguished a fire at the scene. According to eyewitness reports, the Boeing lost altitude quickly and its fuel tank exploded on impact.