The usual sounds of the casino were silenced early on Thursday at the Paris Las Vegas when a construction error caused a massive power outage at the casino that boasts a half-scale replica of the Eiffel Tower.

The machines at the Las Vegas property owned by Caesars Entertainment Corp. (CZR:NASDAQ GS) went black at approximately 9:45 am on Thursday morning. That’s when the property’s main power line was drilled through by a crew working in the resort’s boiler room. The backup generator was hit as well preventing even the emergency flood lights from coming on, according to Jay Sarno, who had had just won $1,000 on his Keno machine, as reported by the Las Vegas Review-Journal.

According to a statement, at approximately 10:30pm on Thursday, power was partially restored at the resort, with guests expected to be permitted to return on Friday by 1am after the resort’s fire alarm system had been thoroughly tested by the Clark County Fire Department. The statement read, “Once that test has been successfully completed, guests who have already checked into the hotel will be allowed to reenter the property,” and, “Additionally, guests can use their existing room keys to access their rooms, new keys should not be necessary. Guests who were not able to check in today are asked to remain at their reassigned locations until tomorrow morning,” according to the news agency.

The power outage at the resort located at 3655 Las Vegas Blvd. South resulted in 11 people being trapped in elevators there. They were rescued by the Clark County Fire Department, and it confirmed that with the exception of anxiety issues none of the hotel guests had been injured.

On Thursday, the resort’s iconic Eiffel Tower replica remained illuminated, its power source not part of the resort’s main line. However, the 2,916 rooms at the property remained dark as did its streetlights. A statement from the Paris later read, “We deeply regret the inconvenience that this unexpected outage has caused our guests and are doing everything we can to remedy this unfortunate situation,” according to the news agency.

Officials planned that at about 6am on Friday, they would update the public .

Paris Las Vegas was owned by Bally’s Entertainment until 2005 when it was acquired by Caesars Entertainment. Bally’s broke ground for the Paris on April 18, 1997, and in September 1999 it opened at an estimated cost of $760 million.