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The entrance to the former Nazi concentration camp Auschwitz-Birkenau with the lettering "Arbeit macht frei" in Oswiecim, Poland is pictured in this Jan. 25, 2015 file photo. (JOEL SAGET/AFP/Getty Images)

Nude protest at Auschwitz

Officials say a group of Polish-speaking people took off their clothes, killed a sheep and chained themselves together by the main gate of the former Nazi German death camp of Auschwitz before being detained by police.

A handout picture released by the British Metropolitan Police Service in London on March 24, 2017 shows Khalid Masood (aka Adrian Elms, Adrian Russell Ajao), the 52-year-old Briton behind the March 22 terror attack at Westminster Bridge and the British parliament. (AFP PHOTO / METROPOLITAN POLICE)

London attacker was 'laughing' on eve of rampage

Police are combing through “massive amounts of computer data” and have contacted thousands of witnesses as they look for clues about why a British-born man became radicalized and launched a deadly attack on Parliament, a senior police official said Friday.