The largest ports in Texas closed operations and vessel traffic on Sunday as Hurricane Beryl intensified as it approached the Texas coast near Houston.Beryl, which left a trail of destruction this week in the Caribbean, killing at least 11 people, was now a category 1 hurricane and may strengthen into a category 2 by landfall on Monday, the U.S. National Hurricane Center (NHC) said.The ports of Corpus Christi, Houston, Galveston, Freeport and Texas City said they closed after condition "Zulu" was set by Coast Guard captains on Sunday.