A volunteer public safety group said it plans to expand its patrols into a second area of Phoenix because residents there have voiced concerns about two serial killers in the city.
Guardian Angels from Apache Junction began patrols last week in an east Phoenix neighborhood, and more volunteers from the national organization were expected to start at a second location, three miles to the south on Saturday night.
The patrols were prompted by a series of shootings that have left 11 people dead and dozens of others wounded.
Guardian Angels founder Curtis Sliwa said 24 unarmed volunteers will be divided between the two locations.
‘‘We just want to keep the visibility up, make (neighbors) comfortable, give them a little relief,’’ Sliwa said, noting the patrols may help reduce other crimes at the second location.
Sliwa said the group has an adequate amount of volunteers and resources in Phoenix, but he traveled to Arizona on Saturday to determine whether the Guardian Angels had enough resources to sustain patrols through August.
‘‘We have to plan appropriately,’’ Sliwa said.
A handful of additional group members were expected to arrive in Phoenix from Chicago and San Francisco, and Sliwa said he hopes to expand membership within Arizona.
Sgt. Andy Hill, a spokesman for the Phoenix Police Department, said investigators have no problem with the Guardian Angels’ patrols as long as members are careful and follow the law.
‘‘It’s really not significant to what we’re doing,’’ Hill said. ‘‘We just want them to be safe and get a hold of us if they have a problem out there.’’