One person has been hurt in a blast at a north London postal sorting office where a bomb went off three weeks ago, said the BBC.online.
Police, including anti-terrorist officers, were called to the building in Hendon at 0153BST on Sunday.
One passer-by received minor injuries but did not need hospital treatment, a Scotland Yard spokesman confirmed.
Police have cordoned off the area and officers are working with ambulance and fire services.
Police also cordoned off a territorial army base in White City, west London, the scene of a previous blast where a 14-year-old cadet lost his hand, said the news service – Albawaba.com