Mayor of London Boris Johnson told ITV News, during a visit to India, that he did not "think it would be right to come up with statutory legislation" ahead of the publication of Lord Justice Leveson's report into press standards.
He added: "You need to have a free press to have a free society. If you want to keep the gutters of public life clean you need a gutter press."
More top news
The hashtag #RoomForManchester was being widely shared.
Witnesses reported hearing a "huge bang" at the venue during the concert on Monday evening.
ITV News travels to Britain's eastern-most city to gauge how the electorate will be casting its votes.