. >> reporter: morgan fletcher and fellow volunteers coach about 100 middle schoolers how to bike in the oakland hills. >> we're guiding the children that if someone asks for the bike, just give them the bike. >> reporter: last april i did a report on a group of robbers targeting cyclists near grizzly peak. it's unclear if police arrested those men. given the locations, the victims suspect the latest cases are connected. >> we love to do night rides, so we start to avoid that. >> reporter: many carbon fiber bikes cost between 5,000 and $10,000. louise says her bike was worth less, but it was the perfect christmas gift from her husband a few months ago. >> really afraid and upset and, um, scared to go back out on my bike right now. >> reporter: safety advocates used to tell people to ride with at least one other person. now they're telling folks to ride in big groups. strength in numbers. at police headquarters, i'm da lin, kpix 5. >> oakland police say they're deploying more officers to areas where they're seeing spikes in robberies. overall, opd says the number of robberies involvin

. >> reporter: morgan fletcher and fellow volunteers coach 100 middle schoolers had a bicycle in the oakland hills j. we're guiding the children that if someone asks for your bicycle, give them the bicycle. >> reporter: last april, a did a report on a group of robbers targeting bicycle identify thes near grizzly peak. it's uncolor if the group was reported. they report the robbers drive an suv and given the locations, the victims suspect the latest cases are connected j. we like to do night ride see we start to avoid that. >> reporter: man carbon phoner bicycles cost between 5 and $10,000. she said her bicycle was worth less but it was the perfect christmas gift from her husband a few months ago. >> really afraid and why up set and scared to go on my bicycle now. judge safety advocates used to tell people to ride with one another person and they're telling folks to ride in big groups. strength number ins. at police headquarters, i'm da lin, kpix 5. >> oakland police are putting officers in more areas where they're seeing spikes in robberies but the number involving guns is down compo

. >> reporter: morgan fletcher and fellow volunteers coach about 100 middle school everiers how to bike in oakland hills. >> we're guiding the children if someone asks for your bike, give them the bicycle. >> reporter: last april, i did a report on a group of robbers targeting bicyclists near grizzly peak. it's unclear if police arrested the group. the victims in the latest cases report the robbers driving the suv's and given the locations, the victims suspect the latest cases are connected judge we like to do noet drives and avoid that. >> reporter: many cost between 5 and $10,000 she said her bicycle was worth less but it was the perfect christmas gift from her husband a few months ago. >> really afraid and upset. and scared to go back out on my bicycle right now. >> reporter: safety advocates used to tell people to ride with one other person and though, they're telling them to ride in big groups, strength in numbers. i'm da lin, kpix 5. >>> oakland police are putting more officers in areas where they're seeing ay so to speak in robbers. overall, the number of robberies involving guns