An investigator with the state prosecutor's office told the Associated Press that the balloon had been landing at about 07:00 (05:00 GMT) when a landing cable got caught around a tube and a fire broke out on board.

BBC: Egypt balloon crash: Two Britons and UK resident die

The cause of the crash is still being investigated but is believed the balloon had been in the process of landing when a landing cable got caught around a gas tube and a fire erupted on board.

BBC: Egypt hot air balloon tragedy: Tributes paid to victims

According to initial indications, the balloon was in the process of landing after 7 a.m. when a cable got caught around a helium tube and a fire erupted, according to an investigator with the state prosecutor's office.

NPR: Fiery Balloon Accident Kills 19 Tourists In Egypt

First of all, every commuter rail system has full time maintenance crews, and they always have plenty of work: changing lightbulbs in the tube, fixing a signal that got bumped, replacing an on-track communication cable that was vibrated out of place and smashed, etc.

FORBES: Why Does BART Need To Do Nightly Maintenance?