The bees' nest, inside the attic of a 90-year-old Douglas, Ariz., homeowner, measured 3 feet by 8 feet and filled a 55-gallon drum. (Photo: Lt. Joseph Alvarez, Douglas Fire Department) 
 
 A swarm of Africanized bees killed one yardworker and critically injured another Wednesday during an attack in southern Arizona, the Douglas Fire Department reported. 
 
 The aggressive bees came from a colony of an estimated 800,000 bees in a 3-by-8-foot nest in an attic. 
 
 The dead man and his injured co-worker were with the Douglas ARC, which finds jobs for people with developmental disabilities, said Fire Chief Mario Novoa. They were part of a four-man crew cutting grass and weeding for the 90-year-old homeowner, who was not stung. 
 
 Two other workers who were stung refused treatment, and a neighbor drove herself to Cochise Regional Hospital for treatment of her stings. 
 
 Novoa said he could not identify any of the victims, the homeowner or the exterminator. 
 
 
 
 It's not clear what caused the attack or how many bees were actually involved, Novoa said. 
 
 He also said it wasn't clear whether the homeowner knew about the massive hive, which may have been accumulating for 10 years. 
 
 
 
 A four-block area was cordoned off after the 10:30 a.m. report of the bee attack. Firefighters in protective bee suits, which are standard equipment in Douglas, first removed part of the eaves and roof before pulling down the ceiling. 
 
 The heavy nest filled a 55-gallon drum after extermination, Novoa said. 
 
 
 
 "There are not many European honey bees left around here, so we treat them all as Africanized bees," he said. 
 
 His said his department receives one or two calls a week about bee swarms or hives, but nothing on the scale of Wednesday's attack. 
 
 Douglas is on the border with Mexico, about 120 miles southeast of Tucson. 
 
 Africanized honey bees continue to spread northward from South America to Mexico. (Photo: Janet Loehrke, USA TODAY; Source: U.S. Department of Agriculture) 
 
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 (CNN) -- One bee after you is bad enough. What about thousands? 
 
 A man in Arizona died after being stung more than an estimated 100 times. 
 
 An exterminator said based on the size of the hive, there were about 800,000 bees. 
 
 Douglas Fire Chief Mario Novoa said his department answered a call Wednesday morning and when the crew arrived they found five people stung by bees and the bees still swarming. 
 
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 While some of the emergency responders treated the victims, other firefighters went around the neighborhood warning residents to close their windows and stay inside. 
 
 Two of the victims were stung many times, the chief said. One of the men died later. He has not been identified and the chief didn't know what the other man's condition was. 
 
 Novoa said an exterminator found a 3-foot by 8-foot hive on an eave of a house. To get to the hive, the exterminator had to cut through part of the ceiling of the house. 
 
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 The 90-year-old owner of the home wasn't injured. 
 
 "We get calls about bees fairly often but I've never seen anything to this extent. This is the first time we have recorded a death in our community from bees," Novoa said. 
 
 Douglas is near the border with Mexico, about a two-hour drive from Tucson.
– One worker died from at least 100 stings and three others were injured when bees from an 800,000-strong swarm attacked a landscape crew outside a home in Douglas, Ariz., yesterday. Firefighters discovered and destroyed a huge 3-by-8-foot hive, believed to be around 10 years old, in the home's attic, reports Tucson News Now. The 90-year-old homeowner wasn't injured, but one other worker from Douglas ARC, a nonprofit group that finds jobs for people with developmental disabilities, is in critical condition. "We get calls about bees fairly often, but I've never seen anything to this extent," the fire chief in the town near the Mexican border tells CNN. "This is the first time we have recorded a death in our community from bees." It's not clear what caused the attack, but the bees appear to have been aggressive Africanized ones, the fire chief says. "There are not many European honey bees left around here, so we treat them all as Africanized bees," he tells USA Today.