The murder of Khaled Said happened in the street and many people have witnessed it , some of them dared and spoke to the media while other were scared and waited to testified in front of the general persecutor. I think among the later was the porter of the building where late Said was killed.
According to he said the agents killed Khaled and they brought a police officer and also a doctor when he seemed to be dead , the doctor confirmed that he was dead after that they covered him with a piece of cloth and waited for the ambulance to come and take him.
As you can see the man himself is scared to stand at the entrance of building for fear the police knows he has spoken to the media or to someone with a video camera.
After knowing the crime , there were rumors that people have already filmed the crime when it was happening on their mobile phones and that police was searching for these videos warning the people there from uploading to the internet. I do not know how correct these rumors are but I hope from the bloggers and activists in Alexandria to search and dig for these videos and to try to convince their owners that its upload to the internet will not harm them.