Authorities issued a second evacuation order in a week for thousands of residents of a Texas city after air monitors discovered cancer-causing chemicals following an explosion and fire at a petrochemical plant. Officials issued the order late on Wednesday in Port Neches, Texas, a city of about 14,000 people 95 miles east of Houston, when monitors found elevated levels of butane and butadiene, a cancer-causing petrochemical. Butadiene is the main product of a TPC Group [TPCL.UL] facility in the city struck by last week’s blaze and blast. Schools were closed for the rest of the week, officials said, after students had only been allowed to return to schools […]