Two police dogs have died after they were left in a car on the hottest day of the year.
The Metropolitan Police animals, a working Belgian Malanois and a German Shepherd puppy, were found collapsed in an unventilated vehicle at the force's training centre in Keston, Kent, on Sunday.
A Met Police spokesman said: "On Sunday June 26 at approx 11am staff at a Metropolitan Police Service (MPS) building were alerted to two police dogs having been left in an unventilated private vehicle.
"Entry was forced to the vehicle and two MPS dogs, a working Belgian Malanois and a German Shepherd pup, were found in a state of collapse.
"Both were taken to an emergency vets where they subsequently died.
"An investigation by the Directorate of Professional Standards into the circumstances of this incident has begun."
The deaths follow those of two German Shepherd police dogs, who were left to die in a baking hot car outside Nottinghamshire Police headquarters in July 2009.
A spokeswoman from the Dogs Trust, the UK's largest dog welfare charity, said it was "saddened" to hear of the two latest deaths.
She added: "Whilst the cause of death is still to be determined, the charity would like to remind dog owners and police dog handlers that leaving your dog in a car can prove rapidly fatal, particularly during a heatwave.
"It can take just 20 minutes for a dog to die and temperatures can reach over 40 degrees in some vehicles."