In a grim incident, Irvine police officers fatally shot a Las Vegas man as he was engaged in the act of stabbing his mother to death. The violence unfolded in a usually tranquil Southern California neighborhood on Thursday.

The Irvine Police Department said they responded to a call about a male suspect armed with a knife chasing a female victim. Upon arrival, the officers witnessed the stabbing in progress and intervened in what became a deadly confrontation. The suspect, after turning and advancing toward the officers, was shot. News3 Las Vegas reported that both individuals were declared dead at the scene.

Police have since identified the assailant as 37-year-old Paul Parvea Montazer from Las Vegas, and his victim was his mother, Parvin Montazer, a 72-year-old Irvine resident. As News3LV.com mentioned, detectives are continuing their investigation into the attack, but they believe there are no additional suspects involved.

The incident took place just before 3 p.m. near Green Tree Lane and Royce Road, in the heart of Irvine. A statement obtained by NBC Los Angeles detailed officers' arrival to the scene where they witnessed the son actively stabbing his mother on the street, prompting them to take lethal action to stop him. Further details regarding what instigated the stabbing have yet to be disclosed. As the community reels from the horror of such a disturbance, the question of "why" lingers, an answer that detectives are striving to uncover in the wake of this family tragedy.

As the investigation proceeds, the Irvine Police Department has not shared more on the circumstances leading up to the attack. The inquiry into the motive and the series of events that precipitated this violent episode is underway - shedding light on this darkest moment may provide some solace to a community shaken by this act of domestic violence turned public spectacle. For updates on this story, one may refer to the continuous coverage provided by NBC Los Angeles.