The Richmond Police Department's communications center was up and running again Thursday morning after a backup battery system overheated and leaked fumes, prompting an evacuation.

The leak started around 4:45 a.m. when the system overheated and released fumes that smelled like sulfur, Richmond police Sgt. Nicole Abetkov said. The police dispatch center is located at Nevin Avenue and 27th Street, across from City Hall.

As dispatchers were evacuated, at least one official in the dispatch center alerted the Contra Costa Sheriff's Office, and a switch of computer systems at the Sheriff's Office allowed all calls to Richmond to be sent to the Sheriff's Office dispatch.

Sheriff's Office dispatchers then relayed information to Richmond police.

The backup power was restored later Thursday morning, and the dispatch center began operating around 8 a.m., Abetkov said.

The Richmond Police Department also dispatches for El Cerrito, San Pablo and Kensington.

Contact Rick Hurd at 925-945-4789 and follow him at Twitter.com/3rdERH.