RAM raiders left a car embedded in a shop window during while burgling a Wembley jewellers in the middle of the night.
The five-strong gang drove the grey or silver 2006 Audi through the doors of Western Jewellers, which has operated in Plaza Parade, Ealing Road, for 10 years, at 4.25am yesterday.
They abandoned the car, smashed display cabinets with at least one sledgehammer, which they left behind, and stole loot to an unknown value although police described it as "a large quantity of jewellery", before fleeing in two other vehicles.
Raj Siva, 28, one of the directors of the family business, said: "They are just looters - timewasting idots. We had the maximum security any jewellery can possibly have, two shutters and two doors, but they literally drove the car into the shop and ripped the whole shopfront off: doors, windows, fittings.
"There were five of them and they had three cars. One car was an Audi A6 which they rammed completely through into the shop, and smashed the shop.
"I've heard a rumour there was a silver Porsche getaway car and a black Ford car. And they definitely left a sledgehammer."
But Mr Siva said the way he crime authorities have handled the case was "a shame".
He added: "The Met Police have been an absolute waste of time. They didn't do anything.
"The incident happened at 4.30am and it took them 12 hours to come inside, look at everything and ask what was wrong, and 14 hours for us to get back inside our own shop.
"This is the sixth jewellers that has been hit so far in Wembley in a year. What are the Met doing?"
Mr Siva has been unable to quantify how much of his 22-carat Asian jewellery stock went missing due to the fact the store's safes are still on a time lock, rendering their contents irretrievable, and the damage to the premises was so extensive.
Brent Police confirmed they are investigating but have been no arrests.
A spokeswoman said the two vehicles the suspect fled the scene in were a black saloon and a silver saloon although the make and model were not known.
She said "a large quantity of jewellery" was taken but that the type had not been given.