just northwest of maclaren park. it all started about an hour and a half ago. police there were responding to a call in the area when they say they were confronted by someone carrying a knife. that person with the knife approached police, and was then shot by at least one officer. tonight we know that person who has not been identified is hospitalized with life- threatening injuries. we're told someone who lives there on bacon street said she heard two gunshots but didn't see what happened. you can tell here a lot of investigators are on the streets there, it's blocked off. again be this is in the 600 block of bacon street. just northwest of maclaren park. an officer involved shooting leaving one person with extremely serious injuries. >>> people on bikes, roller skates or blade can't go there but soon folks on segway's can glide on streets on golden gate park. david is live in the city to explain what some folks' concerns are. >> reporter: after a long approval process, segways are set to roll out in fold end gate p