British Prime Minister David Cameron says there are "strong …
In this 1969 photo provided by NASA the mission commander, Neil Armstrong of the Apollo 11 mission is seen. (AP Photo/NASA)
In this Dec. 1980 file photo released by ABC, Dick Clark is shown. (AP Photo/File)
In this Sunday, Nov. 22, 2009, file photo, Whitney Houston performs onstage at the 37th Annual American Music Awards in Los Angeles. (AP Photo/Matt Sayles, File)
Students greet Penn State coach Joe Paterno as he arrives at his home, Tuesday, Nov. 8, 2011, in State College, Pa. (AP Photo/Matt Rourke)
This May 8, 2006 file photo shows Mike Wallace, longtime CBS "60 Minutes" correspondent, during an interview at his office in New York. (AP Photo/Bebeto Matthews, File)
This undated photo provided by LG Electronics shows engineer Eugene Polley. (AP Photo/LG Electronics)
In this July 6, 1967 file photo Davy Jones of Monkees singing group is shown at press conference at Warwick Hotel in New York City. (AP Photo/RH,File)
In this Jan. 22, 2011 file photo, former Democratic presidential nominee and U.S. Sen. George McGovern arrives for the funeral Mass for R. Sargent Shriver at Our Lady of Mercy Parish in Potomac, Md. (AP Photo/Cliff Owen, Pool, File)
Musician Adam Yauch attends the exhibition 'Welcome To Gulu' at the United Nations on Tuesday, May 12, 2009 in New York. (AP Photo/Evan Agostini)
In this Oct. 26, 2010 file photo, director Tony Scott arrives at the premiere of "Unstoppable" in Los Angeles. (AP Photo/Gus Ruelas, File)
In this 2000 photo, author Ray Bradbury poses for a photo in Los Angeles. (AP Photo/Los Angeles Times, Kirk McKoy)
In this July 28, 2007 file photo, New England Patriots linebacker Junior Seau smiles during NFL football training camp in Foxborough, Mass. (AP Photo/Winslow Townson, File)
Bowler waving baritone Andy Williams performs a song on a television show, May 12, 1961. (AP Photo)
This undated photo released by the U.S. State Department shows U.S. Ambassador to Libya J. Christopher Stevens in an official portrait. (AP Photo/U.S. State Department)
FILE - In this Monday, March 29, 2010, file photo, Sen. Arlen Specter, D-Pa., leads a Senate field hearing, in Philadelphia. (AP Photo/Matt Rourke, File)
Former Gov. Bill Janklow, a lawyer representing landowners, shows a South Dakota Senate committee a photograph as he testifies on Thursday, Feb. 7, 2008, in Pierre, S.D.(AP Photo/Chet Brokaw)
In this April 13, 2012, file photo, Rodney King poses for a portrait in Los Angeles. (AP Photo/Matt Sayles, File)
An undated photo released by NASA shows astronaut Sally Ride. (AP Photo/NASA)
In this Nov. 4, 2011 file photo, actor Larry Hagman pauses during an interview on location during the filming for the upcoming new television show "Dallas" in Dallas. (AP Photo/Tony Gutierrez)
In this photo taken Thursday, Oct. 14, 2010, Art Ginsburg, known as Mr. Food, is shown during TV rehearsal in Fort Lauderdale, Fla. (AP Photo/Alan Diaz)
This Nov. 24, 2008 file photo shows Etta James arriving at the premiere of "Cadillac Records" in Los Angeles. (AP Photo/Matt Sayles, File)
Actor Andy Griffith, Jan. 9, 1984. (AP Photo)
Actor Ernest Borgnine arrives at the 36th Annual FIFI Awards hosted by the Fragrance Foundation, honoring the fragrance industry's creative achievements on Tuesday, May 20, 2008, in New York. (AP Photo/Peter Kramer)
An Aug.11,1986 photo of Sherman Hemsley. (AP photo/Nick Ut)
In this Sept. 6 2011 file photo, children's book author Maurice Sendak is photographed doing an interview at his home in Ridgefield, Conn. (AP Photo/Mary Altaffer, file)
Singer Donna Summer poses with three awards she won at the American Music Awards in Los Angeles, Ca., Jan. 12, 1979. (AP Photo/Nick Ut)
Robin Gibb arrives at the "American Idol" finale in Los Angeles, Wednesday, May 26, 2010. (AP Photo/Chris Pizzello, file)
In this April 28, 2001 file photo, music legend Doc Watson performs at the annual Merlefest at Wilkes Community College in Wilkesboro, N.C. (AP Photo/Alan Marler, File)
This June 1978 file photo shows Richard Dawson, host of "Family Feud" in character. (AP Photo, File)
In this Dec. 2, 2008 file photo, director Nora Ephron is shown at Royce Hall in Los Angeles. (AP Photo/Dan Steinberg)
Phyllis Diller arrives to the ENCORE Original premiere of "Method to the Madness of Jerry Lewis" in Los Angeles on Wednesday, Dec. 7, 2011. (Joe Kohen/AP Images for Starz)
This Wednesday, Jan. 11, 2012 photo shows actor Michael Clarke Duncan in New York. (AP Photo/Carlo Allegri)
This March 6, 2006, file photo shows former host of the television show "Soul Train" Don Cornelius at his office in Los Angeles. (AP Photo/Damian Dovarganes)
In this Jan. 25, 2011 photo, Janice Berenstain holds a copy of the first book, left, she and husband, Stanley Berenstain, created and the second book, the first to actually call the characters Berenstain Bears. (AP Photo/Mel Evans)
Ravi Shankar performs during the opening day of the Paleo Festival, in Nyon, Switzerland in 2005. (AP Photo/Keystone, Sandro Campardo, File)
In this Dec. 6, 2009 file photo, Kennedy Center honoree Dave Brubeck is shown at the Kennedy Center Honors gala in Washington. (AP Photo/Alex Brandon, File)