LOS ANGELES, Calif.–An 89-year-old woman was fatally stabbed this afternoon, allegedly by her grandson, who barricaded himself in a home, police said.

Paramedics and police were called to the 900 block of West 41st Street in South Los Angeles at 2:10 p.m., said Los Angeles Police Department Officer Karen Rayner.

The victim, whose name was not immediately released, was pronounced dead at a hospital, Rayner said. She identified the woman’s unidentified grandson as the lone suspect and said he was believed to be barricaded at the home where the stabbing occurred.

A special weapons team was summoned, Rayner said.