New York ? The state sent extra nurses Wednesday to help out at busy Buffalo hospitals treating people for injuries related to last week’s record-setting snowstorm, which knocked out power to thousands and was blamed for 12 deaths.

More than 170 people have been treated for carbon monoxide poisoning from using improperly vented generators and stoves for heat. Others have hurt themselves or had heart attacks clearing mounds of tree limbs that litter the region.

Health officials said the deaths include one person hit by a falling tree limb, three killed by carbon monoxide and two who died shoveling snow.

With round-the-clock cleanup efforts continuing, about 95,000 homes and businesses remained without power Wednesday and schools in Buffalo and surrounding towns said they would be unable to reopen until next week.