The public should be “getting involved” and “do something physical” if they see a police officer being attacked, according to the Met Police’s commissioner. Cressida Dick said the recent trend of people filming attacks on police and mockingly posting the footage online was “absolutely awful”.She said: “Officers getting assaulted and people thinking that’s funny and putting it on the internet – I think that’s disgusting.”Last month a video of two officers being attacked in Merton, south London, was shared thousands of times after a passing driver stopped to film the assault and posted it on Twitter with the caption “south London at night…lol”.The officers had stopped a car and were attempting to arrest the three occupants, but one ended up being dragged around in the road while the other took a flying kick to the chest and landed feet from the path of a moving bus.Eventually they arrested one of the men with the help of a passing motorcyclist. In September, 122 traffic officers were seconded to the Met’s Violent Crime Taskforce to boost its numbers to 272 for an initial three months.Force bosses now plan to keep the officers in place for longer, although they have not given a time period.The Met’s Roads and Transport Command has around 2,300 officers at full strength and is the largest police unit in the UK. “People stand up and say ‘that’s not right, don’t do that’ and on occasion, if they feel able, get involved and do something physical.”You have to look at the circumstances.”If there’s a man pointing a gun at you we don’t want you running at the man pointing the gun, that would be crazy.”If you see an officer getting a kicking and you feel able to assist, absolutely I want my public getting involved, and we see people getting involved, including in some of those videos.”We don’t want people taking crazy risks, we do want people getting involved.”In the wake of the Merton attack, chairman of the Metropolitan Police Federation Ken Marsh warned that officers might be forced to let violent suspects go.He said: “Are we now in a society where, if we think we can’t detain somebody, we just let them go? It’s just not worth it.”We’re going to come to a point where we’re going to start pushing messages out to our colleagues, ‘Risk-assess it dynamically and, if you think you can’t detain a person, just let them go’.”We don’t come to work to get assaulted, and if we’re not going to be backed up in what we’re doing then what is the point?” The male officer suffered cuts and the female officer was left with head injuries after the assault.’Tide is turning’ against rise in violent crime, insists Met commissionerMetropolitan Police Commissioner Cressida Dick has insisted the tide is turning against the rise in violent crime.So far in the capital this year there have been 123 homicides, more than the 118 in the whole of last year, not including the victims of terrorist attacks.But Ms Dick told LBC that after three years of gun and knife crime increasing, the rate is now starting to level off and come down.Figures released by Scotland Yard on Tuesday showed that in September, October and November this year there were 176 fewer victims of knife crime with injury aged under 25 than in the same three months in 2017, a 31% reduction.Over the course of a year, there has been a drop of 287 victims, a 13% decrease.The Commissioner told Nick Ferrari: “After three years of knife crime increasing, gun crime increasing, they are now not just levelling off but beginning to come down.”These aren’t huge changes. I think, however, we are suppressing it.” She said she was “sickened” by the grim list of homicides this year and wants to see the number reduce. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. Ms Dick encouraged members of the public to step in if they see a police officer being attacked and feel they can help.She said: “I think I want to live in a society, and I think I do live in a society, where people are active citizens.