LOS ANGELES (CBS) — Authorities Friday released the alarming 911 call made by Demi Moore’s friends before the actress was hospitalized earlier this week.

“She smoked something,” Moore’s friend says on the tape, which the fire department redacted in several spots before its release. “It’s not marijuana, but it’s similar to incense and she seems to be having convulsions of some sort.”

The operator tells the friends not to give 49-year-old Moore, who was having difficulty breathing, anything to eat or drink as they wait.

“Has she done this before?” the operator asks.

“I don’t know,” another friend replies. “There’s been some stuff recently that we’re all just finding out.”

Celebrity web sites have been reporting that Moore was inhaling nitrous oxide, or whip-its, which CBS2 could not immediately confirm.

The call lasts several minutes before the paramedics arrive.

Callers initially expressed frustration after a Los Angeles City Fire operator transferred them to the Beverly Hills Fire Department, which then determined that Moore’s crisis should have been handled by the original operator.

Two women can be heard pleading for an ambulance several times before they are transferred back minutes later.

»RELATED STORY: Dispatchers Taking Demi Moore’s 911 Call Confused Over Who Should Respond