A police officer stands on duty outside a house (R) in Fallowfield, Manchester, in northwest England on May 23, 2017, as they search the resdiential property following the May 22 deadly terror attack at the Ariana Grande concert at the Manchester Arena. Twenty two people have been killed and dozens injured in Britain’s deadliest terror attack in over a decade after a suspected suicide bomber targeted fans leaving a concert of US singer Ariana Grande in Manchester. / AFP PHOTO / Oli SCARFF