Some families frustrated by pace of search 

and rescue efforts in Florida building collapse

(CNN)

A mother who said she is worried about her 26-year-old daughter who is missing after the partial building collapse in Surfside, Florida, desperately urged officials on Saturday to do more. 

"I'm a mother. I don't know the best way to go about this. ... Imagine if your children were in there.”

I know you're doing everything you can, but it's not enough," she said in an emotional video posted to Instagram Saturday.

No, it's not enough.

The families of the dozens still unaccounted for following Thursday's partial collapse of a condo building a few miles north of Miami Beach are growing impatient, desperate for faster results from the search and rescue crews who have been digging through the rubble around the clock.