Woman Shot and Killed by Police After Grandson is Stabbed to Death

August 1, 2012 Updated Aug 2, 2012 at 3:24 PM EDT

By John Borsa

August 1, 2012 Updated Aug 2, 2012 at 3:24 PM EDT

BUFFALO, NY (WKBW) - A 38-year-old woman was shot and killed by Buffalo Police officers late Wednesday afternoon after she "lunged towards the officers ... with two large knives," a department spokesman said.

Officers were called to a duplex at 193-195 Esser Avenue in the city's Riverside neighborhood just after 4 p.m.

When they arrived, they found the woman's four-year-old grandson bleeding profusely on the porch. The boy was rushed to Women and Children's Hospital where he later died.

Sources said investigators believe the woman stabbed her grandson before police arrived.

Two officers responded to the home. It is still unclear if one or both fired their weapons. They were on routine patrol in the neighborhood and were flagged down.

A simultaneous 911 call was made around the same time reporting a child had been assaulted.

The officer or officers involved in the shooting are on administrative leave, which is normal procedure in an officer-involved shooting.

The Buffalo Police Department's Internal Affairs Department is investigating the incident, as is the city's Homicide Squad.

An Erie County Grand Jury will eventually hear the case, which is standard operating procedure when a member of law enforcement uses deadly force.