Suspect at large after San Francisco Muni shooting injures one

A man was shot on a Muni bus in San Francisco, and the suspect is currently missing. The victim was taken to a hospital, and there has been no update on his condition. According to a witness, the shooter challenged the victim to fight before shooting him twice. Police are searching for a suspect wearing a brown and gold puffy jacket and are asking anyone with information to contact them. No other passengers were injured.