Children rush to the water flow at Millennium Park, at the height of a heat wave in Chicago.
The United States was sweating through a weekend of dangerously hot weather, with major cities including New York, Philadelphia and Washington experiencing temperatures approaching 100 degrees Fahrenheit (38 degrees Celsius).
An oppressive heat wave stretching from the Midwestern plains to the Atlantic coast had nearly 150 million people struggling to stay cool amid scorching temperatures.
Heat index values -- combining the effect of heat and humidity -- could reach 110 to 115 degrees, particularly in the east, the National Weather Service (NWS) said.
Waves of heat
It warned that "dangerously high temperatures and humidity could quickly cause heat stress or heat stroke if precautions are not taken."
People were being urged to stay hydrated, watch out for the sick and the elderly, stay inside as much as possible and not leave children or animals in cars.
The heat wave already claimed at least three lives, including two earlier in the week in the eastern state of Maryland.
Heat warnings have also been issued for parts of eastern Canada.
In New York, Mayor Bill de Blasio declared a heat emergency.
The New York City Triathlon, which had been scheduled for Sunday, was cancelled for the first time since its founding in 2001.
The estimated 4,000 participants, many of whom had traveled long distances to race, will receive full refunds of entry fees of up to $399, organizers said.
'Serious, serious stuff'
New York City opened 500 cooling centers for residents.
"Saturday is going to be really, really bad, on through Sunday," de Blasio said in a warning to the city. "This is serious, serious stuff."
Climate data showed June was the hottest month on record worldwide, with a heat wave across Europe smashing national records.
The German Weather Service registered 41.5˚C in Lingen, in the west, which had posted 40.9˚C earlier in the day.
A British record high temperature, 38.7°C (101.6 Fahrenheit), may have been reached on Thursday, provisional data from the UK Met Office showed on Friday.
An emergency alert was issued for the state capital Jefferson City advising people to take shelter as heavy rain, hail, wind and lightning struck the state, along with neighboring Oklahoma and Kansas.
Sharjah Police will be deploying specialist teams to ensure that the measures are enforced; walk-through thermal scanners and sanitisation gates at all entry points, free protective supplies for visitors
At least 8 dead, over 120 injured in Turkey earthquake. The death toll is expected to rise.
Aouissaoui had gone to the Notre-Dame church soon after arriving in Nice on Thursday morning looking for a place to sleep, his sister Afef said. He had shown them the area and said he planned to rest in a building opposite the church.
Adviser to the Prime Minister on Parliamentary Affairs Babar Awan said that earlier Dr Siddiqui had reservations over filing the mercy petition, but now she has signed it and the petition was being sent to the US president through the jail authorities.