PHILADELPHIA (WPVI) -- The birthplace of the nation is celebrating the Fourth of July and America's 250th birthday as festivities kick into high gear in Philadelphia.
However, extreme heat is forcing many event cancellations.
An Extreme Heat Warning remains in effect for the entire Philadelphia region. Temperatures in the city are expected to be around 100 degrees through Saturday.
For the latest forecast, visit 6abc.com/Weather.
Meanwhile, ABC is marking America's 250th anniversary with 24 hours of unparalleled programming called "Disney Celebrates America."
Mayor Cherelle Parker hosted Philadelphia's signature civic ceremony, the Celebration of Freedom, at the National Constitution Center Saturday morning.
Conshohocken will kick off Fourth of July with its annual Soap Box Derby, a tradition in Montgomery County that's been racing strong since 1951.
The event shut down Fayette Street Saturday as 35 racers, ages 7 and up, competed in the derby.
At stake is a chance to travel to Ohio for the All-American Soap Box Derby, dubbed the "greatest amateur racing event in the world."
Conshohocken has hosted the qualifying race on the 4th of July for 75 years. It brings together generations of families for a love a racing.
The event was held despite this year's historic heat. The borough opened the fire house on Fayette street as a cooling station and had free water and misting stations available for attendees.
Action News' Cecily Tynan shares the emotional reaction from some people who visited the Liberty Bell in Philadelphia ahead of America's 250th birthday.
The Declaration of Independence was signed in Philadelphia in 1776. ABC News' David Muir was in the room where it all happened - and went into the vault holding some of America's founding documents - including the printer's proof of the Declaration of Independence and the first draft of the U.S. Constitution.
