The Metropolitan Police says it's looking into whether the substance sprayed into the face of an officer may have been ammonia. He was attacked when he stopped a moped rider in Battersea yesterday afternoon.
More top news
A man said to be armed with dangerous articles remains inside an address in west London.
British Bankers' Association head Anthony Browne warned that some banks could be moving abroad within weeks due to Brexit uncertainty.
Police have begun a murder investigation following the stabbing of a 28-year-old in Shepherd's Bush,west London.