Authorities: 5 killed in small plane crash in north Oklahoma

OKLAHOMA CITY — The Oklahoma Highway Patrol says all five people on board were killed when a small passenger airplane crashed in northern Oklahoma on Saturday.The cause of the crash was not immediately known, said Federal Aviation Administration spokesman Lynn Lunsford."A single-engine Extra EA-400 crashed under unknown circumstances ... shortly after taking off from Ponca City Regional Airport," Lunsford said in an email. "The aircraft was destroyed by a post-crash fire," at the site abou