A second video showing the shooting death of Alton Sterling, a black man shot several times while being held on the ground by police outside a Louisiana convenience store, was posted online Wednesday as federal authorities took charge of the investigation and local officials asked residents to keep their protests peaceful.The video, obtained by CNN, shows another angle and was recorded closer to the shooting by one of two white Baton Rouge police officers who were answering a 911 report of a man with a gun. It is the second of two bystander videos that show the encounter. One posted online Tuesday night quickly sparked local protests and drew national attention.In the new 38-second recording, Sterling is already on the ground, on his back. One officer is kneeling to Sterling’s left. The other officer appears to be straddling Sterling’s legs. Sterling can be seen from the chest up and his lower legs are also visible. His left arms and hands are not visible; his right arm is by his side.After gunshots are heard, the camera pans to the right then back to Sterling, who has a large blood stain on his chest. The officer who was on his legs now lies on the pavement above Sterling’s head, his gun pointed.