British police released on Saturday a photograph of Salman Abedi on the night he killed 22 people in a suicide bomb attack in Manchester and said they believed an apartment in the city center was where he put together his device.
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"We know one of the last places Abedi went was the city center flat and from there he left to make his way to the Manchester Arena," Greater Manchester Police Chief Constable Ian Hopkins and Neil Basu, Senior National Coordinator U.K. Counter Terrorism Policing said in a joint statement.
"The flat is highly relevant as a location which we believe may be the final assembly place for the device."
Hopkins and Basu said they had gathered significant information about Abedi, a 22-year-old Briton born to Libyan parents, including how his bomb was built, his associates, finances, the places he had been and the wider conspiracy.
However, police needed any information the public might have about his movements from May 18 when he returned to Britain.
They said the investigation was not slowing, with some 1,000 officers involved, and the priority was to determine if more people were involved in planning the attack.