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The crew of "professional" theives who made off with $30 million in cash after pulling off one of the biggest jobs in Los Angeles history now face a glaring problem, according to a heist expert. 
 
Scott Andrew Selby, co-author of "Flawless: Inside the Largest Diamond Heist in History," suggests the suspects are not yet in the clear.

"As technology progresses and the world gets smaller, there are a lot of ways you can mess up and get caught," Selby said. Whether the money is traceable depends on the serial numbers or whether the cash that was collected is already in circulation.   

"With touch DNA, the slightest mistake can expose the identity of a member of the crew, leading authorities to eventually identify their associates." 

Investigators will also be "looking around the globe for crimes with a similar M.O," reported LA Times. 

Selby highlighted that the theft has "all the markings of a really well-thought-out job" that was done by a "professional crew," adding that based on other major heists of this nature, it is likely that the thieves had some inside intelligence. 

The GardaWorld facility in Sylmar was robbed in the middle of the night on Easter Sunday. L.A. Police Department Commander Elaine Morales said on Wednesday that the crooks were able to breach the buidling and gain access to where the money was stored, according to ABC7. 

Images from ABC7's helicopter show a breach in the side of the building. 

Law enforcement sources are stumped as to how the thieves were able to pull off the heist without setting off any alarms, according to the L.A. Times. The safe that was empited shows no sign of break in, and only a very select few people even knew large sums of money were in there prior to the heist, the Times reported. 

The FBI confirmed to the Times that the bureau is investigating the heist alongside LAPD officers.