Chelsea sack midfieder Jacob Mellis after he set off smoke grenade at club's Cobham training ground Players, officials and other staff from Chelsea's reserve, youth and academy teams ran from the building with hands covering their faces because of the thick smoke. Owner Roman Abramovich was reportedly briefed about the incident, which occurred shortly before training at 10.30am and set off fire alarms and triggered a full evacuation procedure. It was also the latest controversial episode to occur at Chelsea's training ground. Last February, defender Ashley Cole accidentally shot and wounded a work experience student with an air rifle. It is believed Cole did not know the rifle was loaded and he apologised to the student, who did not require hospital treatment. And, late last year, a knife was discovered by cleaning staff in a dressing room at the complex, although this was thought to have belonged to a building contractor on the site.