London Mayor Boris Johnson says Andrew Mitchell's apology "underscores how wrong it is to abuse police officers". Mr Johnson also commented on the police decision not to arrest Mr Mitchell:
That's an operational matter.
In my book you shouldn't abuse police officers. The crucial thing for me is Andrew Mitchell has apologised.
More top news
Dozens of women gathered on Westminster Bridge to form a human chain in a show of solidarity with the victims of Wednesday's terror attack.
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.