Nearly 600,000 customers were without electricity in Texas after severe thunderstorms battered the north-east of the US state, according to media reports.
The latest round of storms brought hurricane-force wind gusts of up to 77mph (123km/h) and golf ball-sized hail.
Tuesday’s extreme weather follows several weekend storms that k!lled at least 24 people across five states, including Texas.
Sweltering heat is also affecting southern Texas, which is still recovering from a storm earlier this month that knocked out electricity to hundreds of thousands of people.
Some north Texans awoke on Tuesday to the sound of tornado sirens, after the National Weather Service (NWS) issued warnings in Dallas and surrounding areas due to the heavy thunderstorms.
There were reports of flooding of residential streets, downed trees and power lines throughout the city.
A disaster declaration was made for Dallas County as officials continue to assess the damage.
At its height, more than 1,070,000 customers were without power on Tuesday morning.
Hundreds of flights out of Dallas were also delayed or cancelled as of late Tuesday morning because of the storms.
