According to the Harris County Sheriff's Office, deputies responded to the scene located at the Dunkin' Donuts in the 12600 block of State Highway 249.
"One of my kids called me and told me that there was this guy bleeding over there outside," the manager of the Dunkin' Donuts, Israel, said. "Then I saw the other kid that was bleeding, and I was like 'Oh my God!'"
When they arrived at the scene, deputies found one victim on the sidewalk with severe head injuries, officials said. The victim was treated by EMS and taken to a nearby hospital, authorities said.
According to investigators, employees of the Dunkin' Donuts gave deputies a description of the possible suspect, who was riding a bicycle. Officials said deputies found a man on a bike who fit the description and detained him for questioning.
Israel said the man who authorities detained was yelling at the man he allegedly attacked.
"The other one was yelling and saying that he did it because the other one had slept with his wife and stuff like that," Israel said.
While they were responding to the scene, deputies received a call about a second aggravated assault in the 13700 block of SH 249, within 2 miles of the first incident, with the victim reportedly having similar injuries. That person was also taken to the hospital for injuries, HCSO said.
Authorities said the man they detained is believed to be connected to both incidents and is currently being questioned. They said they are also speaking with neighbors in the area and reviewing surveillance camera footage.
Investigators said all three people are homeless and known to hang out in the area.
"We are confident. Detectives have obtained information that links our person of interest to both scenes," HCSO Sgt. Russell Gonzales said. "We are also working to link him to additional assaults that have happened in the last day or so."
The Harris County Sheriff's Office is urging anyone with any information regarding this incident to reach out to them or Crime Stoppers.