Texas county outside Houston warns of levee breach due to Harvey

HOUSTON, Aug 29 (Reuters) - Officials in Brazoria County, outside Houston, warned on Twitter on Tuesday that a levee at Columbia Lakes had been breached by floodwaters from Tropical Storm Harvey and urged any residents who had not already evacuated the area to leave immediately. (Reporting by Houston bureau; Writing by Scott Malone in Boston; Editing by Dan Grebler)