Robin Grinholz, of New York, lays flowers on the Imagine mosaic in the Strawberry Fields section of New York City's Central Park on Dec. 8, the 30th anniversary of the death of rock music legend John Lennon. Richard Drew/AP
A doorman stands outside the Dakota on New York City's Upper West Side on Dec. 8, where John Lennon was shot 30 years ago. Richard Drew/AP
John Lennon-related buttons are sold in Strawberry Fields in New York City's Central Park on Oct. 9, the day that would have been John Lennon's 70th birthday. Tina Fineberg/AP
Pictured is the 18-foot 'Peace and Harmony' monument, a gift to the people of Europe to celebrate John Lennon's life, before its unveiling at Chavasse Park in Liverpool, England on Oct. 9. Newscom
Julian (l.) and Cynthia Lennon, the son and former wife of John Lennon, appear at the unveiling of the Peace and Harmony monument in Chavasse Parke in Liverpool, England, on Oct. 9. The inscription reads, 'Peace on Earth for the Conservation of Life. In Harmony of John Lennon 1940-1980.' Tim Hales/AP
People stand around the Imagine Peace Tower as it is illuminated on Videy Island in Kollafjordur Bay near Reykjavik, Iceland, on Oct. 9. The tower, a memorial to John Lennon from his widow Yoko Ono, consists of searchlights pointed high into the sky from a white stone monument with the words "Imagine Peace" carved into it in 24 languages. Ingolfur Juliusson/Reuters
Yoko Ono, widow of John Lennon, former Beatles drummer Ringo Starr, and Reykjavik Mayor Jon Gnarr sing 'Give Peace a Chance' in Reykjavik on Oct. 9. The event was held in conjunction with what would have been the 70th birthday of John Lennon. Ingolfur Juliusson/Reuters
A statue of a young John Lennon stands outside the Cavern Pub on Mathew Street, in Liverpool, England, on Dec. 7. A candlelit vigil will be held in the city to mark the anniversary of John Lennon's death on Dec. 8. Paul Ellis/AFP/Newscom
A John Lennon statue stands at Liverpool Airport in Liverpool, England, in 2008. Newscom/FILE
Japanese artist and musician Yoko Ono poses by a plaque erected to John Lennon during an unveiling ceremony at 34 Montagu Square in London, England, on Oct. 23. John Lennon is commemorated with an English Heritage blue plaque in celebration of his life and contribution to music at the apartment where he shared his first home with Yoko Ono. Sang Tan/AP
John Lennon look-a-like Alan Swoffer poses on Oct. 18 with the new official British commemorative John Lennon £5 coin, which went on sale on Oct. 29. The former Beatle will join William Shakespeare, Winston Churchill, Charles Darwin, and Florence Nightingale among British luminaries whose images have graced special coins. Geoff Caddick/The Royal Mint/AP
James Lehr, of Bayonne, N.J., displays a tattoo of John Lennon on his arm as he and others gather in Strawberry Fields in New York City's Central Park on Oct. 9. Tina Fineberg/AP
Video footage and eye witness accounts from the scene of a brutal murder in London on Wednesday seem to indicate that the attackers may have been politically motivated. Counterterrorism officers are leading the investigation. Two men have been arrested.
Two men with butcher knives hacked another to death Wednesday near a London military barracks and one then went on video to explain the crime — shouting political statements, gesturing with bloodied hands and waving a meat cleaver. Soon after, arriving police shot and wounded the unidentified assailants and took them into custody.