Daniel Barrera, one of Colombia`s most wanted drug traffickers, has been arrested in Venezuela. "Crazy Barrera" was described by Colombia`s President Juan Manuel Santos as "the last big crime boss," who had spent 20 years dedicated to drug smuggling and other crimes. The operation to capture him was conducted with the help of Caracas as well as British and U.S. intelligence agencies, Santos said. Meanwhile, authorities in Colombia have seized a submarine carrying up to four tonnes of illegal drugs. The unmanned vessel was found off the Pacific coast near the municipality of Tumaco. It is a key area for trafficking, where the Colombian army has intercepted more than 20 submarines carrying cocaine since 2007. More about: Arrest, Colombia, Drug trafficking, Venezuela