Dutch authorities are desperately investigating a major art heist of a millenia-old golden helmet from an ancient civilization in current-day Romania.

The items—which include a helmet discovered by playing children—belonged to members of the lost Dacian civilisation

Robbers used explosives to break into the Drents Museum in Assen over the weekend and nab three antique bracelets and a 2,500-year-old gold helmet.

The 5th-century BC Helmet of Cotofenesti was among the valuable items taken during an overnight heist at Drents Museum in the Netherlands.

The Netherlands will help train 26 Ukrainians for positions as F-16 aircraft crew chiefs. The training will run until the end of January, according to the Dutch Ministry of Defense. These technical specialists are responsible for the fighter jets before takeoff and after returning to base.

Several archaeological pieces from the Dacia - Empire of Gold and Silver exhibition showcasing Dacian treasures from Romania have been stolen after an explosion at the Drents Museum in the Netherlands on the night of January 24 to 25.

Following the recent theft at the Drents Museum in the Netherlands, the Brukenthal National Museum in Romania has decided to close temporarily to raise awareness about the importance of protecting cultural heritage.

The police said the golden helmet of Cotofenesti, a highly regarded artifact from Romania, was among the items stolen from the Drents Museum in the Netherlands.

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The Dacian helmet from Coțofenești, stolen days ago from a museum in the Netherlands, where it was on display without appropriate security, dates back to around 400 BC and was found by mistake nearly 100 years ago.

A group of burglars blew up the entrance of the Drents Museum in the Netherlands and ran away with solid gold artifacts on loan from Romania. NBC News' Meagan Fitzgerald has the details as Romanian leaders now question why the precious pieces were in the Netherlands in the first place.