ITV's Daybreak has been told of the 'deadly' nature of carbon monoxide fumes, thought to have killed teenager Hannah Thomas-Jones.
President of the Carbon Monoxide and Gas Safety Society, Stephanie Trotter, said there needs to be better government warnings about items like the disposable barbecue.
More top news
A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
A search is underway for two brothers, aged 1 and 2, who were in their babysitter's car when it was stolen in California.
Officers said the girls were approached during separate incidents earlier this week in south London - possibly by the same suspect.