There has been a spate of reports like the one below this summer; sometimes with fatal results.
It is not the BBQ that is to blame, it is the stupidity of the users. Never, ever light a BBQ, camping stove or gas heater inside a tent. Unless, of course, you want to die. Apart from the obvious fire hazard, these devices consume a lot of oxygen and produce lots of carbon monoxide. Neither of which are good for humans!