A medical jet with six Mexican nationals on board crashed into a busy Philadelphia neighbourhood on Friday, authorities said, marking another US aviation disaster after a passenger plane and a military helicopter collided midair in Washington earlier this week. Video footage appeared to show the twin-engine plane descending at a sharp angle towards a residential area, sparking a huge fireball upon impact and showering wreckage over homes and vehicles. For more details, visit: https://www.dawn.com/news/1889063/6-dead-as-medical-jet-crashes-in-philadelphia-days-after-washington-disaster