A group of landscapers in Arizona were attacked by roughly 800,00 bees while working at a private residence. Three of the four men were severely stung and hospitalized, but the forth died from the stings.

The incident happened on Wednesday when four landscapers arrived at a house in Douglas, near the Mexican border, according to Tucson.com. The workers from Douglas ARC, a nonprofit organization that serves people with developmental disabilities, were swarmed by hundreds of thousands of bees when they started their lawn mowers.

The men ran as the bees enveloped them, finally reaching a neighboring residence where they hid and asked for help and the homeowner called 911. The local fire department arrived and came to the aid of one of the workers, a 32-year-old, who had collapsed.

"A witness said his face and neck were covered with bees," said Capt. Ray Luzania of the Douglas Fire Department. The victim went into cardiac arrest and was pronounced dead at Cochise Regional Hospital.

The captain explained another man got stung more than 100 times and was hospitalized but later released. The other two men refused medical treatment.

According to USA Today, the men were to cut grass and weed for a 90-year-old man who lived alone in the house. He was evacuated when exterminators arrived to eradicate the bees and their hive, which was in the house's attic.

The 3-by-8 foot hive was removed by firefighters wearing protective bee suits and it filled a 55-gallon drum.

"There are not many European honey bees left around here, so we treat them all as Africanized bees," Fire Chief Mario Novoa said.

The Associated Press reports the area will remain cordoned off until the weekend to avoid others from being stung. A Texas A&M researcher also said the bees were likely Africanized bees because of their aggressive response.