Operators Serco said it was a "peaceful protest" and it was talking to the women involved.
Two members of staff had earlier been suspended following allegations of abuse.
Undercover filming by Channel 4 News had shown staff referring to inmates as "animals", "beasties" and "bitches".
The facility houses up to 400 women under threat of deportation.
Speaking in Parliament on Tuesday, Home Office Minister Karen Bradley told MPs Serco "immediately suspended" one member of staff and then another after seeing the footage.
"The company has also commissioned an independent review of its culture and staffing at Yarl's Wood," she said.
Shadow Home Secretary Yvette Cooper has called for an independent inquiry into conditions at the centre.

Russian bantamweight Vladimir Nikitin will not box American Shakur Stevenson after being left bloodied by Conlan.
"The injury suffered by Vladimir is too serious," said Russian official Igor Kazikov.
Stevenson will fight Robeisy Ramirez Carrazana in the final after the Cuban beat Uzbekistan's Murodjon Akhmadaliev.
Nikitin, meanwhile, will still receive a bronze medal.
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Belfast boxer Conlan said after Tuesday's contentious decision that his Olympic dream had "been robbed".
Nikitin's face was badly bloodied after the quarter-final, which most observers felt had been conclusively won by the Irishman.
Immediately after the bout, Conlan made clear his annoyance at the verdict in an expletive-filled live TV interview with Irish broadcaster RTE.
Thursday's development may increase the the pressure on amateur boxing's world governing body, Aiba, which has faced criticism from boxers and coaches in Rio after a number of contentious judging decisions.
On Wednesday, the international body announced that it had dropped a number of officials after a review of their decisions at the Olympics.
Aiba said that, after 239 bouts in Rio, "less than a handful of the decisions were not at the level expected".
The body has admitted it is in a "transition process", but said results of bouts already contested will stand.
About a dozen female detainees at Yarl's Wood detention centre in Bedfordshire were involved in a "small" protest on Tuesday night.
[NEXT_CONCEPT]
The boxer who controversially beat Ireland's Michael Conlan in the Olympic quarter-finals has pulled out of his Olympic semi-final because of injury.