Four people have died in Texas as tropical storm Beryl continues to move through the state, the mayor of Houston said on Monday, while millions remain without power. It will likely take several days to restore the power supply, according to the operator. Some 2 to 3 million households are affected, the chairman of the company said. Meanwhile, a tornado in Jasper County, on the border with the state of Louisiana, destroyed about thirty houses. Beryl made landfall as a hurricane near the Texan town of Matagorda some 130 kilometres south-west of Houston early on Monday morning, but has since lost…