People stop to observe a minute's silence in St. Ann's Square in central Manchester, England, on Thursday to remember victims of Monday's bombing. BEN STANSALL/AFP/Getty Images hide caption
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Forensic teams search the Manchester, England, neighborhood of Salman Abedi, the deceased suspect in Monday's bombing of an Ariana Grande concert. Leon Neal/Getty Images hide caption
A defaced Islamic State flag is emblazoned on a wall in Tikrit, Iraq, in 2015. ISIS will generally claim responsibility for an attack within one day, though it can sometimes take longer. Mohammed Sawaf/AFP/Getty Images hide caption
A police officer stands on duty outside a residential property in Fallowfield, in southern Manchester, on Wednesday as investigations continue into the bombing at the Manchester Arena. Oli Scarff /AFP/Getty Images hide caption
A sign with flowers and candles lay on the ground after a vigil in Albert Square in Manchester, England, on Tuesday, the day after a bombing at an Ariana Grande concert killed at least 22 victims. Kirsty Wigglesworth/AP hide caption
British Prime Minister Theresa May leaves 10 Downing Street after addressing the media in London on Tuesday. Carl Court/Getty Images hide caption
Balloons and flowers filled a memorial in Albert Square in central Manchester, in northwest England, in tribute to the victims of the Monday night attack at the Manchester Arena. Chris J. Ratcliffe/AFP/Getty Images hide caption
A woman lays flowers for the victims of the Manchester Arena attack in central Manchester, England, on Tuesday. Darren Staples/Reuters hide caption
People attend a vigil in Albert Square in Manchester, after the city in northwest England absorbed the worst terror attack on U.K. soil since 2005. Ben Stansall/AFP/Getty Images hide caption