PORT OF SPAIN, Trinidad - The announcement of President Hugo Chavez's return to Venezuela after a 10-week silence in Cuba is raising questions about his cancer treatments, his delicate health, and the political purposes that motivated his homecoming. Three messages appeared on Chavez's Twitter account early Monday saying he was back, and the government announced that he had arrived at 2.30 a.m. and was taken to Caracas' military hospital to continue with his treatments. The government released no images of the president, though, and while his supporters threw street celebrations to welcome him, some also said they wanted to see him to get a better idea of how he is doing. The government has said Chavez is undergoing "complex and tough" treatments for his illness but hasn't specified what sort of treatment. The government has said he is breathing through a tube inserted into his windpipe and therefore has difficulty talking, but officials haven't given a detailed medical report despite demands by the opposition.