greg donaldson it has been _ does not work. greg donaldson it has been interesting - does not work.oes not work. greg donaldson it has been interesting to get i it has been interesting to get your analysis. thank you for your analysis. thank you for your time here on bbc news. stay with us on bbc news, much more to come. the shuttle challenger exploded soon after lift—off. there were seven astronauts on board, one of them a woman schoolteacher. all of them are believed to have been killed. by the evening, tahrir square, the heart of official cairo, was in the hands of the demonstrators. they were using the word 'revolution'. the earthquake singled out buildings and brought them down in seconds. tonight, the search for any survivors has an increasing desperation about it as the hours pass. the new government is firmly in control of the entire republic of uganda. survivors of the _ auschwitz concentration camp have been commemorating the 40th anniversary - of their liberation. they toured the huts, - gas chambers and crematoria and relived their- horrifying experiences. welcome back.

greg donaldson is an associate professor investment professor who teaches nypd officers at executiveas written extensively on policing tactics. . , tactics. he gave me his reaction _ tactics. he gave me his reaction to _ tactics. he gave me his reaction to the - tactics. he gave me his reaction to the release | tactics. he gave me his. reaction to the release of tactics. he gave me his- reaction to the release of the footage. i watched the video and it was appalling. it was incomprehensible from beginning to end, from the car stop, the state of agitation of the police when they pulled the car over, to the pursuit, to the lack of training and lack of strategy in containing and subduing the person they had stopped and then the anger that they received as their incompetence. even the fact that during the foot pursuit they were all completely out of breath and poorly trained from a to z, and it was awful to watch. now let's hear some reaction from the community in memphis. we can now speak to reverend jason lawrence turner of the mississippi boulevard christian church. thank you forjoini

well, earlier, ispoke to greg donaldson, who's associate professor atjohnjay college of criminal justicehim what his reaction was to the video footage. i watched the video and it was appalling. it was incomprehensible from beginning to end, from the car stop, the state of agitation of the police when they pulled the car over, to the pursuit, to the lack of training and lack of strategy in containing and subduing the person they had stopped and then the anger that they received as their incompetence was more revealed. even the fact that during the foot pursuit they were all completely out of breath and poorly trained from a to z, and it was awful to watch. it really was. you would have thought by now that lessons should have been learned. does there need to be a massive overhaul now in police culture and how they work with the community? i think if we take it back, this needs to be looked at on a number of levels. one level in terms of police reaction to spikes in crime. what they did was they create these units, this is the scorpion unit. in new york they have the street crime unit, miam