A fridge has been leaking freon, which is an extremely dangerous substance.
Freon is a tasteless, mostly odorless gas. When it is deeply inhaled, it can cut off vital oxygen to your cells and lungs.
Fire and rescue services have had to use gas tight suits to make the scene safe.
They tweeted earlier:
"There is currently an incident in Wing involving a refrigerator leaking Freon.
"Crews from Aylesbury and Leighton Buzzard and an officer are attending.
"Gas-tight suits are being worn"