A man was struck in the head and injured after at least two male intruders entered his home in what authorities described as a hot prowl burglary in Arcadia early Thursday morning.
Authorities were called to the home in the 1900 block of South Tulip Lane regarding an assault with a deadly weapon around 1:10 a.m., the Arcadia Police Department stated in a news release.
Investigators believe the attackers forced their way into the home to burglarize it and then woke a sleeping resident by striking him over the head with an unknown object.
The man's wife and 17-year-old son were also believed to have been home.
The victim sustained serious injuries and was transported to a hospital.
As of Thursday night, the man's daughter, Grace Tang, said she did not know his condition, but she was told "there was a lot of blood" at the scene.
The burglars, who fled the home following the attack, were described as men, wearing dark clothes and masks, armed with handguns.
Tang believed the men were wearing ski masks and did not speak during the assault, limiting the available description.
It was unclear whether they took anything from the home.
The attack was described as "strange" by Tang, who said the area was typically very quiet.
Neighbors planned to meet after the assault to discuss security and how to handle similar incidents in the future, a local said.
Anyone with information was asked to contact the Police Department at 626-574-5151.
KTLA's Ashley Soley-Cerro contributed to this report.