Kenya’s President Mwai Kibaki won a second five-year term on Sunday in a disputed electionvictory that triggered deadly riots by tens of thousands of opposition supporters. Pushing the stakes still higher, his opposition rival Raila Odinga rejected the results as rigged and announced an alternative inauguration for Monday in a Nairobi park. To curb spreading chaos in a nation usually known as a haven of stability in volatile east Africa, the government sent trucks of police onto the streets and banned live TV transmissions. As smoke billowed from protests in Nairobi slums, Kibaki was sworn in an hour after the final vote tally was announced.