Oakland Police have arrested several suspects in the fatal shooting last week of Officer Tuan Le, the department announced Tuesday.

Le was fatally shot on Dec. 29 after he and other officers were responding to a burglary at a suspected illegal marijuana grow house at Embarcadero and 4th Avenue in Oakland, California. Le was struck in the back of the head by gunfire while driving an unmarked truck and crashed into two parked cars. He was taken to an area hospital and later died from his injuries, CBS reports.

In a press statement issued at around noon Tuesday, police said one suspect was arrested within the last 10 hours along with "several" other suspects arrested over the weekend.

"In collaboration with our law enforcement partners, OPD has made significant progress in the investigation, resulting in several additional arrests over the weekend," said the press statement. "This is just the beginning of a lengthy legal process; we are hopeful that it will start the healing for Officer Le's grieving family and our entire OPD family."

Police sources told local media the person arrested Tuesday is the individual suspected of pulling the trigger in the shooting. Jail records indicate he is 27-year-old Mark Demetrious Sanders, arrested in Livermore at 12:30 a.m. Tuesday.