Crews have been working to dislodge boulders from a cliff to reduce the risk of rockfall on a neighborhood in Billings.

A rock slide Sept. 21 sent a boulder into one home and left debris on a street. City workers want to clear the street but are wary of using explosives to break up the boulders.

They don't want vibrations to send more rocks down from nearby cliffs. Crews on Friday worked to dislodge two loose boulders above the neighborhood.

One boulder came down with help from a balloon inflated inside a crack. The other boulder resisted four attempts with explosives but workers plan to keep trying.