The California Fire Page is reporting a “mass casualty” incident in San Gabriel this morning in the 700 block of East Valley.

As many as six people were shot according to a Twitter alert sent out by the organization. The site of the incident is near the intersection of Valley Boulevard and San Gabriel Boulevard, according to the early report.

Sheriff’s homicide detectives have been dispatched to the scene, according to Sheriffs Sgt. Barry Hall.

Here’s the updated story as we know it:

SAN GABRIEL – At least one person is dead after a shooting at a coffee house in the 700 block of East Valley Boulevard late Thursday, authorities said.

The shooting, which occurred about 11:20 p.m., injured as many as six people, authorities said. Two masked men reportedly opened fire in the crowded restaurant, authorities said.

Los Angeles County Sheriff’s Department Homicide officials have been dispatched, Sheriff’s Sgt. Barry Hall said.

“We’re rolling,” Hall said.

San Gabriel Fire Batallion Chief Bryan Frieders said there were multiple gunshot victims at the location. Of those three were listed in critical condition and two were listed in stable condition, he said.

The shooting took place inside a coffee house, Freiders said.

“It’s a little cafe right there at the corner,” he said.

In all engine companies from ALhambra, Monterey Park and San Marino responded to the shooting, Freiders said.

“We had four engine companies, four paramedic ambulances and two basic life support units on the scene,’ he said. It sepaks to the effectiveness of mutual response.”

No victim or suspect descriptions were available. The shooters fled the scene in an unknown direction.

No further details are available.