POLICE have found the stolen BMW used by four armed robbers in a daylight smash and grab on a Mill Park jewellery store this morning.

Investigators have been told four people wearing balaclavas and armed with hammers entered the Michael Hill store at Westfield Plenty Valley about 11.45am.

The four men shattered glass cabinets and stuffed jewellery into bags in front of shocked shoppers.

Police located a stolen black BMW SUV at the intersection of Plenty Rd and Clune St, Kingsbury, about 12.50pm.

Witness Robert Kovacic said he heard four loud bangs as the thieves broke through cabinets.

DEVELOPING: Police are responding to reports of a robbery at a South Morang jewellery store. #7News pic.twitter.com/Hu71bMwtFO — 7 News Melbourne (@7NewsMelbourne) March 14, 2017

“(The staff) were very upset and are very shocked — I think it’ll hit them very soon,” he told AAP.

Another witness, Vicky, told Neil Mitchell on 3AW that it was pandemonium.

“The screaming was horrendous, absolutely horrendous,” she said.

Another witness, Zeina Hamad, posted on Facebook that it sounded like gunshots.

“Smashed the windows, everybody running for their lives. Sounded like gunshots!!!

“So many people are shaken up including customers and employees. What’s happening to this world!”

Anyone with information is urged to contact Whittlesea Criminal Investigation Unit on 9407 3355.