Staff at an east London jewellery store were threatened with a hammer after a Jeep was crashed into the shop in a smash-and-grab raid.
Police raced to the scene of the incident, which happened on a busy road in Leyton, shortly after 4pm on Tuesday.
A vehicle was driven through the front of A&R Gold in Church Road, near the junction with Led Bridge Road.
A quantity of jewellery was stolen, and the suspects fled on foot, Scotland Yard said.
Paramedics also attended and treated a man for shock.
A Met Police spokesman said: "The Met's Flying Squad are investigating.
"No arrests and enquiries continue."
Anyone with information about this incident can call 0208 345 4226, Tweet @MetCC or Crimestroppers on 0800 555 111.