Mother and child among seven killed in Philadelphia medical jet crash

Debate & Current Affairs Helper, Life & Style Forum Helper

A small medical transport plane crashed into several buildings in the US city of Philadelphia on Friday evening, killing all six people on board and at least one other person on the ground, the mayor has confirmed.

The jet was on a medical transport trip, heading to Tijuana, Mexico, with a short stop-over in Missouri. It was carrying a child patient and her mother, along with two pilots, a doctor and paramedic. They were all Mexican nationals.

But just one minute after take-off, the Learjet 55 plummeted to the ground. Videos show the plane coming down quickly and sparking a huge fireball.

https://www.bbc.co.uk/news/articles/ckg0m5n8g0do

Any thoughts on what could cause this jet to plummet to the ground?