Yahya Jammeh has been sworn in for a fourth term as Gambia's president and promised to "wipe out 82%" of workers, accusing them of being lazy.The former army officer promised to be "even more dangerous than when I was in uniform".He also vowed to turn his tiny West African nation into an "economic superpower" over the next five years.President Jammeh first seized power in 1994 but was re-elected in December in a widely criticised poll."You cannot be in your offices every day doing nothing... and at the end of the day you expect to be paid," he said on a televised address on Wednesday."This has to stop. You either do your work or leave or go to jail," the president said."I will wipe out almost 82% of those in the workforce in the next five years starting this Friday unless they change their attitudes," he said - without elaborating.Mr Jammeh also promised "zero tolerance" on corruption and drugs.The Gambia - a popular destination for foreign tourists - has recently become a key transit point for cocaine trafficked from Latin America.The president also promised to focus more on the empowerment of women and create more jobs for the youth.Mr Jammeh - who first came to power in a bloodless coup in 1994 - has been criticised by international rights groups for suppressing any dissent.On Tuesday, former Information Minister Amadou Scatred Janneh, a US citizen, was sentenced to life in jail for plotting a coup and distributing T-shirts with the slogan "End to Dictatorship Now".