The number-two figure in Zimbabwe's opposition was Friday facing a treason charge after his arrest within minutes of arriving back home to campaign in the June 27 presidential run-off election. Police also detained Movement for Democratic Change (MDC) leader Morgan Tsvangirai twice Thursday in central Zimbabwe, holding him for some two hours the first time, and about four hours the next, before releasing him. Tendai Biti, secretary-general of the MDC, could face the death penalty if convicted of treason. The charge he faces centres on claims he plotted to rig an MDC victory in first-round elections three months ago.