(Portland, OR) -- Police say two people were killed by falling tree limbs in separate incidents in the Portland area on Saturday morning. Two homeless men were hit by a falling limb near Northeast Sandy Boulevard and 118th Avenue. One man died and the other was hospitalized. About a half hour later, a teenager who was volunteering in a Troutdale Park was hit by a limb and killed. The volunteers were planting trees in the park. Arborists say it's important to use caution under trees and to always look for signs of deterioration that might lead to a limb or tree falling.