Anchorage municipal officials say at least 16 roofs have buckled in the city this winter under heavy snow and ice, and they’re wary of additional collapses after another storm dropped more snow this weekend.

This is the second reported roof collapse in Anchorage in two days.

Engineers caution that residents wanting to clear their own roofs face greater risk of hurting themselves or damaging roofs than from a collapse.

The roof collapsed at a South Anchorage gym during a fitness competition. The Anchorage Office of Emergency Management cautioned residents that the city has had near-record snow conditions this winter, and residents should consider the snow load on their roofs. Officials also warned that property owners should exercise extreme caution if removing snow from their roofs themselves.

The library in Palmer partially collapsed on Wednesday evening near closing time.