The home secretary, Shabana Mahmood, added her voice on Friday to calls to postpone the event, after police said they wanted to be able to focus their resources on protecting Jewish and Muslim communities. The Metropolitan police commissioner, Sir Mark Rowley, said that continuing protests after the attack “will likely create further tensions and some might say lacks sensitivity”. The organisers, Defend Our Juries, said in a statement on Friday that supporters, including many Jewish people, wanted the protest to go ahead. It expected 1,500 people, including priests, vicars, pensioners and others, to take part in the event, which would involve them peacefully sitting holding cardboard signs saying “I oppose genocide. I support Palestine Action”.