Burglars drill through roof of cash depository in Los Angeles, steal $30 million. It is one of the largest burglaries in the city's history, police say.

Elaborate and complex, the heist appears to be the work of an experienced team. The thieves broke through the roof to gain access to the building's vault and escape the sophisticated alarm system, according to the Los Angeles Times, citing a source close to the investigation. It took place Sunday and was only discovered Monday, when staff opened the vault.