Severe storms kill at least 4 in Houston, knock out power to 850,000 homes and businesses

Severe thunderstorms have hit southeastern Texas for the second time this month, and Houston's mayor says at least four people are dead. There have also been windows blown out of high-rise buildings, downed trees and power outages for more than 850,000 customers. Flights were briefly grounded at Houston’s two major airports Thursday. The storm system moved through swiftly, but flood watches and warnings remained for Houston and areas to the east. Heavy storms slammed the region during the first week of May, leading to numerous high-water rescues, including some from the rooftops of flooded homes.