HARLINGEN, Texas (ValleyCentral) — Three residents and a Harlingen firefighter were stung during a bee attack Sunday morning, Harlingen fire officials said.

The incident occurred approximately at 11 a.m. on the 100 block of Oklahoma Street.

Harlingen Fire Department Captain Rene Cantu told ValleyCentral, a resident was mowing their lawn when a neighbor noticed the bee attack, called 911 and helped the resident.

When firefighters arrived, they put on protective gear and assessed the situation. At the scene, a firefighter was also stung.

Both residents were severely stung during the attack. Both of them, plus a firefighter were transported to a secure location near Lamb Street and Ed Carey Drive for medical care, Cantu said.

Additionally, a bystander was also stung but refused medical treatment.

The residents and firefighter were later transported to Valley Baptist Medical Center. Fire officials said, both residents were stung several times and the firefighter was released at 2 p.m.

At the scene, firefighters found a beehive hidden inside a hollow tree where the resident was cutting the yard. Fire officials said the bees may have become agitated with the noise of the lawn mower, which caused the attack.

Cantu said in the past four days at least three to four bee attacks have occurred due to the spring season.