The Health and Safety Executive has launched an investigation at the Tremarle Home Park in Camborne, Cornwall after three people and a dog died from suspected carbon monoxide poisoning.
Carbon monoxide has no taste, smell or colour. The Gas Safe Register says that the most common cause of carbon monoxide poisoning results from badly fitted or faulty appliances.
More top news
British astronaut Major Tim Peake has his trip on the International Space Station extended by almost two weeks.
Hundreds of protesters have stormed Iraq's government district after lawmakers failed to meet for a vote on overhauling the regime.
A 13-year-old girl had a lucky escape after she was grabbed by a man as she walked alone