“A mass casualty situation has been declared after an explosion ripped through a Pennsylvania nursing home leaving multiple people trapped. The blast tore through Silver Lake Healthcare Center in Bristol Township, Pennsylvania at around 2.17pm. First responders and emergency management officials had described the scene as a gas explosion. However, that will not be confirmed until the agency can examine the scene up close, Nils Hagen-Frederiksen, the press secretary at the Pennsylvania Public Utility Commission, told the Associated Press. There is no word on how many people have been injured. The explosion was labeled a mass casualty incident by Upper...