SAN ANTONIO -

A tip about the vehicle described in an Amber Alert centered around a missing 11-month-old boy led police to apartments in the 2300 block of Austin Highway on Tuesday.
In the initial alert, the vehicle was described at a black Chevy Trailblazer with disabled Texas license plate number 7CZTJ.
The vehicle was located at the apartments, but police did not find the man they were looking for, 23-year-old Jonathan Guillen. Investigators say the vehicle belongs to Guillen's mother.
Guillen is accused of shooting and killing his mother's boyfriend Thursday at the Oak Village apartments at 2334 Austin Highway.
Guillen took off with his 11-month-old son, Jonathan Jose Guillen, Jr., according to police.
Invetigators believe the child to be in grave or immediate danger, prompting the Amber Alert issued Monday.
KSAT 12 News asked SAPD why the alert was issued four days after the child was taken.
"Early on in the investigation, to my understanding, there was not enough information to trigger the Amber Alert," said Sgt. Javier Salazar.  "There wasn't sufficient information to give an identifiable vehicle. During the course of the investigation, we developed information on a vehicle that was commonly associated with the suspect."
As of late Tuesday afternoon, police did not have a new description of the vehicle Guillen may be driving.
SAPD says at the time the child was taken, Guillen did have lawful possession of the child. SAPD says they are investigating whether the child is actually Guillen's son.

Investigators have been in contact with Guillen's mother and say she is not cooperating with police.

Guillen is described at 5 feet 8 inches, 185 pounds, with brown hair and brown eyes.

Anyone with information on the abduction is urged to call the San Antonio Police Department at 210-207-7660 or 911.

To read more stories done by Myra Arthur, click here.