Jewellery was stolen in a smash-and-grab raid from two shops at an exclusive shopping centre, police said today.
Burglars broke into De Beers and Omega at the Royal Exchange in the City last night.
City of London police said they did not yet know the value of the stolen jewellery.
A spokesman said: "Just after 10pm last night De Beers and Omega were broken into at the Royal Exchange and a burglary took place.
"Police are now investigating the incident."
The Royal Exchange, built in 1565, is located between Threadneedle Street and Cornhill and boasts more than 30 luxury stores.