BERKELEY -- Hotel guests and residents of the Berkeley City Club were evacuated from the historic building Tuesday afternoon after a woman used a toxic chemical in her room to commit suicide, authorities said. 
 
 Police spokesman Officer Ethell Wilson said hazardous materials crews and bomb squad technicians responded to the call on the third floor of the six-story landmark shortly before 2 p.m. The victim reportedly left a suicide note outside her apartment alerting first responders to the hazardous situation, police said. 
 
 The name of the victim, a woman in her 80s, was not released. Wilson did not know how many people were evacuated, but there were no reports of injuries Tuesday evening. 
 
 Police closed Durant Avenue between Telegraph and Shattuck avenues for several hours while crews investigated. It was not immediately known if the toxic substance -- sodium azide -- had contaminated the entire building or the one unit. 
 
 Check back for updates. 
 
 Reach Kristin J. Bender at kbender@bayareanewsgroup.com. Follow her at Twitter.com/kjbender. ||||| UPDATE, 9:10 p.m.: The person who committed suicide today at the Berkeley City Club was an 80-year-old woman who killed herself in her room using sodium azide, according to the Oakland Tribune. The woman lived in an apartment on the third floor of the landmark building, police officer Ethell Wilson said. The Tribune also reported that the woman left a note warning authorities of the dangerous situation. Sodium azide, a colorless salt, is the gas-forming component in many car airbag systems. When mixed with water it is acutely toxic. 
 
 Despite this report, it is unclear, however, how, or if, the woman was affiliated with the Berkeley City Club. In an email to its members sent out just before 9 p.m., the club said “no Member, resident nor team members were involved nor in harm’s way.” 
 
 ORIGINAL STORY: Berkeley Police are investigating a suicide that appears to have involved a potentially hazardous material at the Berkeley City Club on Durant Avenue. 
 
 According to Berkeley Police Sgt. Joe Okies, three agencies — Berkeley Police, Berkeley Fire and the University of California Police Department — have been working in unison since around 2 p.m. today to remove the suspicious material before the coroner could come on scene. 
 
 Okies could not say what the suspicious material was, or provide details about the deceased person, while the investigation was ongoing. 
 
 Berkeley City Club, at 2315 Durant Ave., between Ellsworth and Dana streets, has been evacuated and all traffic and pedestrians are being forced to take detours from the 2300 block of Durant. AC Transit buses have also been diverted. 
 
 The call about “a person down” came in at 1:56 p.m., Okies said. “Emergency services responded and discovered what appeared to be a suicide involving hazardous materials,” he said. “There was a coordinated effort to remove the material.” 
 
 At 6:30 p.m the coroner was not yet on scene. The joint command was taking steps to make the building safe. 
 
 “The known quantity of what appeared to be a hazardous material has been removed,” Okies said. He confirmed the suicide took place inside the Berkeley City Club, but said he could not be more specific. 
 
 The death investigation was ongoing at 6:30 p.m. and the 2300 block of Durant was still closed, due mainly, said Okies, to the large quantity of vehicles and equipment situated there. 
 
 Berkeley Fire also responded initially to the incident, according to Deputy Fire Chief Avery Webb. But, he said, “it was determined to be a component that made it a law enforcement situation, so [police] assumed control of the situation.” 
 
 The Julia Morgan-designed Berkeley City Club is a hotel and private social club with an indoor swimming pool and a restaurant, as well as a hair salon and meeting spaces. 
 
 This story is being updated as new information became available. 
 
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– The landmark Berkeley City Club was evacuated yesterday after an 80-year-old resident used a toxic chemical to kill herself in her room. Police in the California city say Hazmat teams and bomb squad technicians were called in after a note was found outside the woman's third-story apartment warning of the danger, the Oakland Tribune reports. Police say a "known quantity of what appeared to be a hazardous material has been removed" and steps are being taken to make the building—which houses both hotel guests and residents—safe, reports Berkeleyside. The woman is believed to have used sodium azide, a colorless salt used as the gas-forming component in car airbag systems. It becomes extremely toxic when mixed with water.