BBC News By Joshua Cheetham image copyrightGetty Images image captionHuman rights groups are calling on Myanmar's military to end it's use of lethal force against civilians On a busy street in Yangon, police are escorting a man as gunfire crackles in the background. The man appears to be in custody and is showing no resistance - then suddenly an officer shoots him from behind, kicking him as he lies on the ground. The incident, captured on video, is one of dozens that have been reported since a military coup in Myanmar on 1 February brought protesters onto the streets. Crackdowns against protests have already killed over 70 people, according to a UN estimate.