Coral Springs police officers were "stunned and upset" to learn that four Broward County Sheriff's Deputies were stationed outside the Marjory Stoneman Douglas High School and had not entered to face an active shooter, sources with the Coral Springs, FL police department told CNN.

As the details behind the Police response to the Valentines Day massacre emerge, it appears that the Coral Springs Police department - which sent 130 officers to the scene - put their lives on the line while Broward County officers simply waited for backup as the scene unfolded, in what some Coral Springs officials perceived to be a derilection of duty. 

Some Coral Springs police were stunned and upset that the four original Broward County Sheriff's deputies who were first on the scene did not appear to join them as they entered the school, Coral Springs sources tell CNN. It's unclear whether the shooter was still in the building when they arrived.

The four Broward Sheriff's deputies, including fired High School Resource Officer Scot Peterson, had their pistols drawn from behind the safety of their vehicles, and "not one of them had gone into the school," according to shocked Coral Springs police.