OKLAHOMA CITY—A flight from Washington to Los Angeles was diverted to Oklahoma City after an unruly passenger assaulted a flight attendant, police said. An air marshal who was on board the Delta Air Lines flight had the passenger in custody when the flight landed Thursday night, Oklahoma City Police Capt. Arthur Gregory told TV station KFOR. The Transportation Security Administration says the air marshal was also assaulted during the response and was injured but didn’t need medical attention. The flight continued on to Los Angeles after the passenger was removed. In a statement, Delta praised the “quick action and professionalism” of its crew and air marshals for their handling of the situation. Police said the passenger was booked into jail on complaints of disorderly conduct and public drunkenness. Last month, Attorney General Merrick Garland directed U.S. attorneys across the country to prioritize prosecutions of federal crimes that occur on commercial …