
British actress Keira Knightley poses as she arrives for the world premiere of "Anna Karenina" in London on Tuesday, Sept. 4, 2012. (AP Photo/Sang Tan)

British actress Keira Knightley poses as she arrives for the world premiere of "Anna Karenina" in London on Tuesday, Sept. 4, 2012. (AP Photo/Sang Tan)

A commuter reads a newspaper featuring the Boston marathon bomb blasts on the front page, while waiting for a train at East Croydon station in south London, Tuesday, April 16, 2013. British police are reviewing security plans for Sunday's London Marathon, the next major international marathon, because of the bombs that killed three people at the marathon in Boston Monday. (AP Photo/Sang Tan)

A commuter reads a newspaper featuring the Boston marathon bomb blasts on the front page, while waiting for a train at East Croydon station in south London, Tuesday, April 16, 2013. British police are reviewing security plans for Sunday's London Marathon, the next major international marathon, because of the bombs that killed three people at the marathon in Boston Monday. (AP Photo/Sang Tan)

British sports minister Hugh Robertson, shown here in a July 26, 2011 file photo, said Britain "won't be cowered by this sort of behavior" in announcing that Sunday's London Marathon will go on in the wake of Monday's bombings at the Boston Marathon. (AP Photo/Sang Tan)

British sports minister Hugh Robertson, shown here in a July 26, 2011 file photo, said Britain "won't be cowered by this sort of behavior" in announcing that Sunday's London Marathon will go on in the wake of Monday's bombings at the Boston Marathon. (AP Photo/Sang Tan)

British Foreign Secretary William Hague (AP Photo/Sang Tan)

** FILE ** This Sunday July 10, 2011, file photo shows chairman of News Corporation Rupert Murdoch, right, and his son James Murdoch, chief executive of News Corporation Europe and Asia, in central London. (AP Photo/Sang Tan, file)

Tesco, the United Kingdom's biggest supermarket chain, took out full-page newspaper ads on Thursday, Jan. 17, 2013, to apologize for an unwanted ingredient in some of its hamburger: horse meat. The contrite grocer told customers that "we and our supplier have let you down and we apologize." (AP Photo/Sang Tan)