Four diamonds worth millions were reportedly stolen Wednesday from a diamond trader exhibiting at the BaselWorld watch and jewelry show in Basel, Switzerland, news outlets report.

A spokesman for the Basel prosecutor's office, Markus Melzl, issued a statement to the following effect: "On Wednesday, 30 March 2011, at around 11:00 am, one of the as yet still unidentified perpetrators distracted an employee of a diamond trader in the exhibition hall 3.0, and stole four diamonds worth millions from the display window."

The trader noticed the theft only about 15 minutes after the diamonds had been taken, and the hall was closed for half an hour. Nevertheless, the suspects apparently managed to leave the premises with the diamonds.

Melzl noted that the theft was "carried out in a very professional manner."

Police were examining security camera footage from the expo and search for possible DNA traces and fingerprints that the suspects might have left behind.

BaselWorld 2011, the largest event of its kind in Europe, opened on March 24 and runs through today. Over 1,800 exhibitors – including luxury watch manufacturers, diamond manufacturers, and diamond jewelry designers – are showing at this year's event.