Pennsylvania houses went up in flames after a massive explosion that investigators say was caused by a suspected propane cylinder failure. #fox #foxnews #media #breakingnews #us #usa #new #news #breaking #pennsylvania #explosion #fire #fireball #breakingnews #emergency #disaster #homes #propertydamage #investigation #publicsafety #firstresponders #firefighters #accident #propane #community #destruction #rescue #incident #localnews #safety Don’t just watch Fox News—be part of it. Become a Fox