A tense rally was held outside the Metropolitan Detention Center in Brooklyn on Saturday following news reports that hundreds of inmates there have spent the past week largely without power or the ability to communicate with their attorneys or families. The federal Bureau of Prisons said Saturday work to restore power to a detention center in New York City where inmates have gone without heat and electricity for a week will be completed by Monday.

A group at the rally vowed to camp outside the facility until conditions improve, CBS New York reports. Video posted to social media showed protesters shining flashlights on the dark correctional facility.

A congresswoman who visited the Metropolitan Detention Center in Brooklyn for the second time on Saturday said officials are not taking the situation seriously enough.

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"The inmates are very, very angry and complaining," said Rep. Nydia Velazquez, a Democrat whose district includes the jail. "We expressed our frustration that the warden is not approaching this with a sense of urgency.

Velazquez first visited the jail Friday after seeing news reports that hundreds of inmates there have spent the past week largely without heat, power or the ability to communicate with their attorneys or families.

After being denied access to inmates on Friday, Velazquez returned Saturday with fellow Democratic Congress members Jerry Nadler and Carolyn Maloney as well as city and state lawmakers, and this time the elected officials spoke with inmates.

"After visiting MDC again today it is clear the officials there have disregarded the basic human rights of inmates. This appalling situation needs to be fixed and I will continue pressuring BOP for immediate action," Velazquez tweeted Saturday.

State Sen. Zellnor Myrie, who represents the district, tweeted that the Bureau of Prisons had "gave us incoherent explanations and showed no sense of urgency, and little desire to address the crisis at hand."

Meanwhile, the BOP gave us incoherent explanations and showed no sense of urgency, and little desire to address the crisis at hand. #MDC — Zellnor Myrie (@zellnor4ny) February 2, 2019

State Sen. Jessica Ramos, who represents parts of Queens and also visited the facility, tweeted the facility did not "activate a command center."

When the power went out on Jan 26, they did not activate a command center. They still haven’t bc they don’t see this as an emergency— so much so the contractor they hired won’t be back until Monday. — Jessica Ramos (@jessicaramos) February 3, 2019

The New York Times first reported Friday inmates at the detention center had been stuck in their cells without lights or heat since last weekend when an electrical fire knocked power out. Lawyers who had been able to speak with their clients at the jail said some inmates were suffering health consequences from the lack of heat.

The Bureau of Prisons acknowledged in an emailed statement Saturday that the jail "experienced a partial power outage due to a fire in the switchgear room." The bureau said a new electrical panel is being installed by an outside contractor and work is expected to be completed by Monday.

The bureau said air temperatures in the units "were within acceptable ranges" Saturday.

This undated image shows the Metropolitan Detention Center in Brooklyn. Google Maps

Velazquez disagreed. She said lawmakers measured the temperature as low as 49 degrees in some cells. "The heat is sporadic and it's uneven," she said.

Lawyers for inmates at the facility, which houses people awaiting trial or awaiting sentencing on federal crimes, have said that clients with health problems have been suffering in cold cells without access to warm clothes or blankets.

Lawyers with the Federal Defenders filed a motion Thursday in Brooklyn federal court on behalf of inmate Dino Sanchez asserting that Sanchez, who suffers from asthma, "has been left to freeze in his short-sleeved jumpsuit in the dark." The court papers say jail officials have taken no steps to provide Sanchez with "an oxygen mask, clothing, blankets, or access to a habitable location that will mitigate his health risks."

Velazquez said she heard similar complaints from inmates Saturday.

"It's a violation of human rights and also it's a matter of health issues, but also compromising the safety and security of correction officers," Velazquez said. "People are angry and they're going to express that in any way they can."

In addition to affecting the heat, the outage has knocked out power to the computers that inmates use to email their families and attorneys and to request refills of prescription medications. Some inmates have been able to talk to lawyers with the Federal Defenders on a dedicated line, but inmates represented by other lawyers haven't been able to call them.

"I need to find out what's going on with my clients," lawyer Ezra Spilke said Friday. "They've basically been incommunicado from their attorneys since the 27th, which is when the electrical fire happened."

Officials with the American Federation of Government Employees, the union that represents corrections officers at the jail, have confirmed the lawyers' accounts of the jail conditions.

"They're just waiting for a disaster to happen," jail employee Rhonda Barnwell, who works in the facility's medical station, told reporters Friday. "There's only heat in the afternoons since we've been complaining today."

Velazquez first visited the jail Friday and was not allowed to speak with inmates, although she heard them. "The inmates were banging on the walls, the doors," she said. "It was surreal."

The conditions at the jail drew condemnation from human rights advocates.

"This is worse than countries that we denounce," the Rev. Al Sharpton said at his weekly rally. "This is disgraceful and inexcusable."

Donna Lieberman, executive director of the New York Civil Liberties Union, said in a statement, "It is shocking that the government would hold people for days on end in a dark, freezing jail during one of the coldest weeks in memory."

Dozens of activists including a brass band rallied outside the jail Saturday. One group vowed to camp outside the facility until conditions improve.