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Flowers, messages and candles are pictured in St Ann's Square in Manchester, northwest England on May 25, 2017, placed in tribute to the victims of the May 22 terror attack at the Manchester Arena. Police said they arrested two men Thursday in the Manchester area in connection with the deadly bombing of the Ariana Grande pop concert, while a detained woman was released without charges. Britain has raised its terror alert to the maximum level and ordered troops to protect strategic sites after 22 people were killed in a suicide bomb attack a pop concert on May 22. / AFP PHOTO / Ben STANSALL (Photo credit should read BEN STANSALL/AFP via Getty Images)

Flowers, messages and candles are pictured in St Ann's Square in Manchester, northwest England on May 25, 2017, placed in tribute to the victims of the May 22 terror attack at the Manchester Arena. Police said they arrested two men Thursday in the Manchester area in connection with the deadly bombing of the Ariana Grande pop concert, while a detained woman was released without charges. Britain has raised its terror alert to the maximum level and ordered troops to protect strategic sites after 22 people were killed in a suicide bomb attack a pop concert on May 22. / AFP PHOTO / Ben STANSALL (Photo credit should read BEN STANSALL/AFP via Getty Images)
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Flowers, messages and candles are pictured in St Ann's Square in Manchester, northwest England on May 25, 2017, placed in tribute to the victims of the May 22 terror attack at the Manchester Arena. Police said they arrested two men Thursday in the Manchester area in connection with the deadly bombing of the Ariana Grande pop concert, while a detained woman was released without charges. Britain has raised its terror alert to the maximum level and ordered troops to protect strategic sites after 22 people were killed in a suicide bomb attack a pop concert on May 22. / AFP PHOTO / Ben STANSALL (Photo credit should read BEN STANSALL/AFP via Getty Images)

Flowers, messages and candles are pictured in St Ann's Square in Manchester, northwest England on May 25, 2017, placed in tribute to the victims of the May 22 terror attack at the Manchester Arena. Police said they arrested two men Thursday in the Manchester area in connection with the deadly bombing of the Ariana Grande pop concert, while a detained woman was released without charges. Britain has raised its terror alert to the maximum level and ordered troops to protect strategic sites after 22 people were killed in a suicide bomb attack a pop concert on May 22. / AFP PHOTO / Ben STANSALL (Photo credit should read BEN STANSALL/AFP via Getty Images)
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A man makes a heart-shape out of candles alongside flowers and messages in Albert Square in Manchester, northwest England on May 24, 2017, placed in tribute to the victims of the May 22 terror attack at the Manchester Arena. Police on Tuesday named Salman Abedi -- reportedly British-born of Libyan descent -- as the suspect behind a suicide bombing that ripped into young fans at an Ariana Grande concert at the Manchester Arena on May 22, as the Islamic State group claimed responsibility for the carnage. / AFP PHOTO / Ben STANSALL (Photo credit should read BEN STANSALL/AFP via Getty Images)

A man makes a heart-shape out of candles alongside flowers and messages in Albert Square in Manchester, northwest England on May 24, 2017, placed in tribute to the victims of the May 22 terror attack at the Manchester Arena. Police on Tuesday named Salman Abedi -- reportedly British-born of Libyan descent -- as the suspect behind a suicide bombing that ripped into young fans at an Ariana Grande concert at the Manchester Arena on May 22, as the Islamic State group claimed responsibility for the carnage. / AFP PHOTO / Ben STANSALL (Photo credit should read BEN STANSALL/AFP via Getty Images)
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