US heatwave: Temperatures soar ahead of 250th birthday celebration

The United States is in the grip of a heatwave, as the country prepares to celebrate 250 years of independence. People are being warned not to spend too much time outside, even as big outdoor events take place in the nation's capital. Al Jazeera’s Richard Gaisford reports from Washington DC. Subscribe to our channel: http://bit.ly/AJSubscribe Follow us on Twitter: https://twitter.com/AJEnglish Find us on Facebook: https://www.facebook.com/aljazeera Check our website: http://www.aljazeera.com/