Police, firefighters and ambulance staff are currently at the scene of John Lewis in Bluewater Shopping Centre which has been evacuated. It is believed the chemical spillage was from a fridge in the department store.
There are unconfirmed reports of injuries as a result of the leak.
More top news
The body of a 15-year-old boy has been recovered from the River Thames after he was spotting in difficulties in the water.
A woman and a boy have been killed after a car police were pursuing crashed into a family.
A 23-year-old man has died after being injured in an altercation inside a minicab.