Airbnb CEO Brian Chesky said Saturday the company will ban “party houses” and take other steps to safeguard hosts and guests after five people died at a Halloween party hosted at California home that was rented on the service.

Chesky made the announcement via a series of tweets Saturday. “What happened on Thursday night in Orinda, CA was horrible,” Chesky wrote. “I feel for the families and neighbors impacted by this tragedy — we are working to support them.”

Chesky then announced that party houses would be banned and that the company is “redoubling” efforts to combat unauthorized parties.

Chesky announced several other measures to increase safety, including the expansion of manual screenings of high-risk reservations flagged by Airbnb’s risk detection technology and creating a dedicated “party house” rapid response team

Margaret Richardson, from Airbnb’s executive team, has been tasked to accelerate the review process to enact these new policies as soon as possible, he added.

 

Contra Costa County Sheriff’s Office said the party had been advertised on social media as a mansion party, the San Francisco Chronicle reported. Police were headed to the home Oct. 31 over noise complaints when the gunfire began around 10:50 p.m. Several people died at the scene. The fifth victim died Friday night.