A United Airlines jetliner headed from Washington to Los Angeles was diverted to Denver on Tuesday night after it encountered turbulence, and more than 20 people were injured. Rescue personnel indicated that most of the injuries were not severe. The twin engine Boeing 777 carried 255 passengers and a crew of 10. Flight 967, which was scheduled to leave Dulles International Airport at 5:25 p.m., landed in Denver about 7:30 p.m. Mountain Daylight Time. A spokeswoman for Denver Health Medical Center said more than 20 people had been taken to Denver area hospitals. "We've transported 21 patients to five area hospitals," said Dee Martinez, spokeswoman for Denver Health, a trauma center. She said most of the injuries appeared to be "moderate head, neck and back injuries."