Surveillance Video Reveals New Details About London Jewel Heist

— -- Newly-released surveillance video reveals clues about how a gang of jewel thieves made off with a major haul on Easter weekend.

The group stole jewelry from the vaults of the Hatton Garden Safe Deposit Company building in London’s jewelry quarter. Authorities are having difficulty determining the exact amount of the jewels taken, but the total amount has been estimated in the $100 million-to-$150 million range.

The British newspaper The Daily Mirror, which first obtained the surveillance footage, used pet names to identify six of the bandits seen in the footage: Mr. Ginger, the Gent, Mr. Strong, Mr. Montana, the Tall Man and the Old Man.

Over the course of four days, the team can be seen hauling all sorts of gear -- including a large monkey wrench and what appears to be bolt-cutters. Duffel bags, plastic bins and a getaway vehicle are also visible in the surveillance footage.

Police say the group descended an elevator shaft before using a diamond-tipped drill to cut through six feet of reinforced concrete to access the vault, where the group raided dozens of safety deposit boxes.

Police are under fire after admitting they didn’t respond to the first alarm -- and now an internal investigation is underway to find out why.

Meanwhile, Scotland Yard is scouring surveillance video, looking for any clues leading to the men behind one of the biggest heists in British history.