(CHICAGO) Chicago Police are reviewing security videos taken on CTA buses and have downloaded video from a camera on a light pole at 57th and California for evidence that might lead to the killer of a family of six in Gage Park, a department spokesman said Tuesday.

Detectives routinely look for video surveillance for potential leads in killings, CPD spokesman Anthony Guglielmi said. “This isn’t anything unusual,” he told the Chicago Sun-Times.

On Thursday, Maria Herminia Martinez, 32, was found shot to death in her home. Her sons, Leonardo Cruz, 13, and Alexis Cruz, 10, died of “sharp force” injuries.

The boys’ grandfather, Noe Martinez Sr., 62, also died of sharp force injuries, and his wife Rosaura, 58, and their son, Noe Martinez Jr., 38, died of a combination of sharp and blunt force injuries, the medical examiner’s office said.

Police said the family was “targeted” but have not provided a motive. The doors were locked, nothing was taken, and the house wasn’t ransacked, police said.

The house in the 5700 block of South California is a few doors from the light-pole camera.

The bodies were discovered in what police called “a bloody mess” after a co-worker called 911 to report that Noe Martinez Jr. hadn’t shown up for his job washing windows at O’Hare Airport for the previous two days.