UPDATED: Large police response at Yorktown HS after threatening phone call

(Updated at 12:55 p.m.) It’s likely a hoax but a threatening phone call prompted another large police response at Yorktown High School today.
Someone called 911 shortly before noon, claiming to be in a bathroom at the school and planning a shooting, according to a police dispatch. The call taker could then hear gunshots and screaming in the background, possibly from a recording.
Officers arriving on scene reported no suspicious activity outside nor inside the school, which was quickly plac