Stay indoors warning issued in two US states as toxic gases fill the air

More from Science & Technology

• Chilling video shows UFO-linked scientist revealing disturbing encounters before her death fueling questions over suicide ruling

• How to prevent the Gulf Stream from collapsing? CLOSE the Bering Strait, experts say

• Bloodbath on the streets as millions of dogs are 'massacred' by firing squad ahead of the World Cup

• Brace yourself for a SUPER El Niño: Likelihood of unusual climate pattern skyrockets - as scientists warn it could push global temperatures to record highs

• The eerily realistic manikin used to train trauma surgeons for knife and gunshot wounds: Grisly images reveal dummy that beats, breathes, and bleeds just like a real human

• How to create secure passwords: Experts reveal why you should NEVER reuse or write down your logins - and why it might be time to finally switch to a passkey

• Researchers reconstruct 42 missing pages from a major early Christian manuscript - revealing text unseen for centuries

• You're removing stains WRONG! Experts reveal how to eliminate everything from tomato sauce to blood - and explain why white wine won't shift those red wine spills

• The real-life KRAKEN: Giant octopuses the same size as sperm whales roamed the oceans 72 million years ago, study finds

• Missouri's Cooter rattled by earthquake with shockwaves felt across multiple states

• Final moments of UFO researcher's life revealed as police release chilling minute-by-minute timeline

• Biblical discovery in Egypt as statue linked to story of Moses is found near the Red Sea

• Africa is splitting in TWO: Scientists uncover a huge tectonic boundary under Mozambique and Tanzania

• Mystery of the 'golden egg' discovered at the bottom of the sea is SOLVED: Scientists finally pinpoint its true identity - three years after it sparked fears of aliens

• UFO researcher's chilling final warning before grisly death adds to growing conspiracy fears

• They don't make them like they used to! Jazz and classical music has become simpler over the last 60 years - and is now 'comparable to pop and rock'

• Revealed: The most streamed artists, songs and podcasts in Spotify's 20-year HISTORY - so, did your favourite make the cut?

• How Australia's iconic Twelve Apostles formed: Study reveals how tectonic plate movements over millions of years lifted and tilted the giant structures out of the sea

• Apple CEO Tim Cook abruptly resigns and names successor

• 'Habemus CEO': Social media users compare Apple's new CEO selection to the election of the POPE - as one jokes 'white smoke seen from Apple Park'