RIO DE JANEIRO, Brazil (Reuters) -- Thieves tunneled into a bank in northeastern Brazil and stole $68 million, the biggest bank heist in the nation's history, police said on Monday. "It's something you see in the movies. They dug a tunnel ... that goes underneath two (city) blocks. They've been digging for three months," police investigator Francisco Queiroga told Reuters by telephone. The thieves broke into a branch of the central bank in the northeastern state of Ceara over the weekend and removed 156 million reais ($68 million). The theft was not discovered until Monday morning because the bank was...