(CNN) -- Authorities executed search warrants late Saturday night on a car and a residence where the suspect in the Arizona shooting, Jared Loughner, lived with his parents, a law enforcement source said.
Six people were killed and 12 others wounded, including U.S. Rep. Gabrielle Giffords, when a gunman opened fire in front of a Safeway supermarket in Tucson, Arizona, on Saturday, authorities said. The congresswoman had been hosting a meeting with constituents Saturday morning when the attack began.
The law enforcement source said Loughner's parents appeared to be cooperating with authorities, but the source did now know to what extent.
Loughner, however, was still not cooperating. He had earlier invoked his right against self-incrimination.
Meanwhile, authorities completed evidence collection from the crime scene, but the number of rounds recovered was not immediately known, the source said.
In addition, a surveillance camera in the supermarket showed the suspect inside before the shootings. The other individual that authorities are looking for was seen close to the the suspect.