"Officials in Houston are just beginning to grapple with the health and environmental risks that lurk in the waters dumped by Hurricane Harvey, a stew of toxic chemicals, sewage, debris and waste that still floods much of the city."

"CROSBY, Texas — A flooded chemical plant near Houston exploded twice early Thursday, sending a plume of smoke into the air and triggering a fire that the firm plans to let 'burn itself out.'"

"Residents of cities in Jefferson County, Tex., about 100 miles east of Houston, were desperate for help Wednesday morning after rain there caused floodwaters to rise precipitously and lightning made things particularly difficult for those responding to the storm."

"With Tropical Storm Harvey dumping record rainfall on Houston, the U.S. Army Corps of Engineers faced a dilemma as water volumes rose to perilous levels in its two reservoirs west of the city center."

"Around 13 million people are under flood watches and warnings stretching from Corpus Christi to New Orleans as the remnants of Hurricane Harvey menace the already drenched Texas and Louisiana."

"Harvey continued to intensify as it steered for the Texas coast, with the forecasters saying early Friday that it had strengthened to a Category 2 storm."

"A hurricane warning was issued for the Texas coast Thursday morning, as Harvey regained tropical storm strength as it drifted in the Gulf of Mexico."

"Federal officials and contractors months ago surreptitiously began what appears to be preparation work for construction of border wall on the Santa Ana National Wildlife Refuge in South Texas. Word recently got out and has galvanized opposition to that plan – and to the way it has been carried out."